'It makes a revealing contribution to debates about how we group students in class ... a powerful and cogent collection of research which will help those of us trying to develop an assessment for learning strategy in which students work collaboratively to support each other's learning.' - Times Educational Supplement''This is a book that has something for everyone with an interest in cooperative learning. That said, it also provides sufficient depth and background information to engage readers that have had little or no previous involvement in this area.' - Educational Psychology