A study of the psychological development of the child and adolescent as influenced by heredity and the environment - the context of multiplicative interaction in which all human development occurs. Although importance is placed on the contemporary contextualist view of psychological development, classic perspecives are analyzed. The interrelatedness of theory, research, and applications is emphasized. Current social issues related to child and adolescent psychological health and welfare are addressed. Fall, Spring. Prerequisite: PSY 101.