These important volumes offer a new perspective on mental illness which links mental disorder to normal development. Each prominent author strives to elucidate the reciprocally-informing nature of normal and abnormal development, thereby contributing to theoretical advances in these respective areas. Volume 1 covers the history, theory and techniques of this new viewpoint and examines the relationship between developmental psychopathology and genetics, neuropsychology, epidemiology and ethology. It also explores the implications for psychometric theory. Volume 2 deals with assessment, classification and diagnosis; risk factors including maltreatment and family discord; and disorders ranging from retardation through addictions to schizophrenia.