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“This is an excellent book … . In 2002, a group of researchers began the Virtual Math Team Project, which is still active during 2009. The goal of the project is to provide a new opportunity for students to engage in mathematical discourse. … The book provides thoughts for explorations of group knowledge building and presents an effective online environment and educational service for collaborative learning of mathematics. … book will be matter of interest to researchers and practitioners within the mathematics education field.” (Valentina Dagienë, Zentralblatt MATH, Vol. 1178, 2010)