"This state of the art handbook reflects a truly international authorship, with comparable scope in topic coverage - with a focus on democratic access, learning contexts, research methods, and the changing technological world. If you want up-to-date scholarship in these areas, this is the source." --Alan Schoenfeld, University of California, Berkeley"This handbook provides a comprehensive and topical map of research in mathematics education. It is not only an indispensable resource for those interested in a broad overview of the priorities of the research field, but also provides penetrating analyses of the major developments within those priority issues. The volume brilliantly reflects the dynamics of research topics in mathematics education; change, advance, and transformation constitute the organising principles of the book. Without doubt, the third edition of this handbook is essential reading and a cutting edge reference in the field." --Uwe Gellert, Professor of Mathematics Education, Freie Universität Berlin, Germany