Introduction

This Introduction describes the scope and aims of ICMI Study 25: Teachers of Mathematics Working and Learning in Collaborative Groups and provides a brief overview of each chapter in the Study volume. The primary aims of the Study are to report the state of the art in mathematics teacher collaboration with respect to theory, research, practice, and policy; to represent teachers’ experiences and learning through their own voices as well as the voices of researchers; and to suggest new directions of research. Four chapters in the Study volume summarize the ideas about mathematics teacher collaboration generated by the theme Working Groups with respect to theoretical perspectives; contexts, forms and outcomes; roles, identities and interactions of participants; and tools and resources. Five chapters present the perspectives on these topics by invited plenary authors and reactors, and the plenary panel of teachers. The final two chapters offer reflections on the Study themes and chapters in this volume by invited commentators. Future directions of research in mathematics teacher collaboration are also discussed.