In a book of intellectual breadth, James Wertsch not only offers a synthesis and critique of all Vygotsky's major ideas, but also presents a program for using Vygotskian theory as a guide to contemporary research in the social sciences and humanities. He draws extensively on all Vygotsky's works, both in Russian and in English, as well as on his own studies in the Soviet Union with colleagues and students of Vygotsky.