Lev Vygotsky was one of the most talented and brilliant of Soviet psychologists. Despite his tragically early death at the age of 38 his accomplishments are enormously impressive: he played a key role in restructuring the Psychological Institute of Moscow; set up two research laboratories in the major cities of the USSR; founded what we call special education; and authored some 180 works. His innovative theories of thought and speech are important not just for psychology but for other disciplines also. Yet even though his ideas have increasingly won popularity there remains a strong need for...