Piotr Gal'perin's criticism and extension of Lev Vygotsky's work

Piotr Gal'perin (1902-1988) was a main figure of Soviet psychology and the last of the generation of psychologists who had had personal contacts with Lev Vygotsky. Vygotsky is perhaps the most influential and acclaimed Russian psychologist of this century, and his theory already belongs to the history of the social sciences. Consequently, there is a need for a thorough analysis of the hypotheses that originated within the context of Vygotsky's sociocultural theory.