Contains important writings on the development of human psychology from early childhood to adolescence, by a Russian researcher working in the early 20th century. Section I contains about half of the chapters from Vygotsky's book, "Pedology of the Adolescent", which was published during his lifetime. Section II consists of separate articles published after his death. Themes include the social and cognitive determinants of the transition from elementary psychobiological processes to conscious psychological phenomena, the integration of psychological phenomena in consciousness, and the nature of psychological inquiry. Annotation c. by Book News, Inc., Portland, Or.