Title

Preface

Peter Bender, Paderborn Some Paradigms of Mathematics Education - and how the Work with Computersis Related to them (with particular Consideration of Geometry Teaching)

Lisa Hefendehl-Hebeker, Duisburg On Aspects of Didactically Sensitive Understanding of Mathematics

Friedhelm Käpnick, Braunschweig "But Figures aren't supposed to have one System only" About the Development of Subjective Number Conceptions of Elementary - School Children

Christine Knipping, Hamburg Proof and Proving Processes: Teaching Geometry in France and Germany

Hermann Maier, Regensburg How much Technical Language do Pupils need in Mathematics Education?

Silke Ruwisch, Köln Situated Multiplying in Primary School: Counting instead of Adding!

Johann Sjuts, Leer Metacognition in Mathematics Lessons

Ralph Schwarzkopf Argumentation Processes in Mathematics Classrooms - Functional Argumentation Analysis: a Method to describe Orally Developed Arguments

Birgit Burchartz; Martin Stein, Münster Reasoning and Problem Solving Processes of Primary and Secondary Students working on Tasks with a goal that cannot be reached

Heinz Steinbring, Dortmund How do Mathematical Symbols acquire their Meaning? - The Methodology of the Epistemology-based Interaction Research

Rudolf Straesser On the Disappearance of Mathematics from Societal Perception

Hans Günter Senftleben My Collection of geometrical Ideas - Experiences and Suggestions for a Classroom Project on geometrical Eigenproductions in Primary School

Edited by: Gesellschaft für Didaktik der Mathematik (GDM) Hans-Georg Weigand, Neville Neill, Andrea Peter-Koop, Kristina Reiss, Günter Törner, Bernd Wollring