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This book presents the outcomes arisen from the 2005 CERME Networking Group and connects different theories within mathematics education research. The group has developed strategies for the networking of theories and this book is the outcome of the joined efforts of thoroughly empirical research Radford. investigating strands and issues of these networking practices. This unique work intent to explain and illustrate what it means to network theories and to present networking as a research practice. At the same time, it shows how the activity of networking generates questions at the theoretical and practical level and how these questions can be treated leading to new insights on a content level and the level networking of theories. The Networking group was initiated and coordinated by Angelika Bikner-Ahsbahs, its founding members were Mich