This study addresses the process of developmental change as it occurs in the course of classroom lessons. The book aims to answer such questions as what forms of teacher-student interaction are most effective for producing developmental transformations in children's understanding. It also addresses why knowledge derived from psychological experiments on children's learning and development so often seems irrelevant to classroom teachers and how it is possible to reconcile Piaget's emphasis on the central role of independent intervention and constructive activity with learning theorists'...