Department of Education

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Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based interventions in the area of proof that was published in Educational Studies in Mathematics (2017, vol. 96, pp. 119-274). He was an Editor of Research in Mathematics Education and is currently an Editorial Board member of the International Journal of Educational Research and the Elementary School Journal. He is also an Advisory Board member of the International GeoGebra Institute.

He co-chaired or co-organised topic study groups or working groups at the 11th International Congress on Mathematical Education (Mexico, 2008), the 2nd International GeoGebra Conference (Austria, 2011), the 8th Congress of the European Society for Research in Mathematics Education (CERME) (Turkey, 2013), the 9th CERME (Czech Republic, 2015), the 13th International Congress on Mathematical Education (Germany, 2016), and the 10th CERME (Ireland, 2017). He is currently the leader of the topic working group on “argumentation and proof” at the 11th CERME to be held in Utrecht (the Netherlands, 2019).

He received an American Educational Research Association SIG/RME Publication Award for his 2009 article Reasoning-and-Proving in School Mathematics Textbooks.

Gabriel Stylianides is Professor of Mathematics Education at the Department of Education and a Fellow of Worcester College. He is the convenor of the Subject Pedagogy Research Group and the Director of Doctoral Research.

His research focuses on issues related to the meaningful engagement of students of all levels of education (including university students) in fundamental mathematical practices – notably reasoning-and-proving, problem solving, and algebraic thinking. In pursuing his primary research interests he also addressed issues related to task design and implementation, instructional interventions, curricular resources (including textbooks), technological environments (including intelligent tutoring systems), and methodology (including design experiments).

His research projects have been supported by various funding bodies: the US National Science Foundation, the US Department of Education (Institute of Educational Sciences), and the Spencer Foundation.

He was a Guest Editor or co-Editor of three special issues published in different international research journals: a special issue on classroom-based interventions in mathematics education that was published in ZDM – The International Journal on Mathematics Education (2013, vol. 45, pp. 333-495), a special issue on the place of reasoning-and-proving in mathematics textbooks at different levels of education that was published in the International Journal of Educational Research (2014, vol. 64, pp. 63-168), and a special issue on research-based inte