Inspired by the work of Herbert C. Quay, this book builds on recent theory and research to explore the psychopathology of child and adolescent disruptive behavior disorders. The wide-ranging chapters cover oppositional defiant disorder, attention-deficit hyperactivity disorder, conduct disorder, and other subjects. The work provides a rich sample of the sort of scientific activity Dr. Quay encourged, and will encourage researchers to further pursue issues in this fascinating field.