This book reviews theoretical and empirical work in the developmental approach to mental retardation. Armed with methods derived from the study of typically developing children, developmentalists have recently learned about the mentally retarded child's own development in a variety of areas. These areas now encompass many aspects of cognition, language, social and adaptive functioning, as well as of maladaptive behavior and psychopathology. In addition to a focus on individuals with mental retardation themselves, familial and other "ecological" factors have influenced developmental approaches to mental retardation. Comprised of twenty-seven chapters on various aspects of development, this handbook provides a timely, comprehensive guide to understanding mental retardation and development.