Originally published in 1976, this volume is organized about two central themes: the experimental analysis of aggression, and the application of learning principles to the prevention and modification of delinquency. The chapters, all new and original at the time, demonstrate how the problems of aggression, which had been interpreted in diverse ways, can be analyzed under controlled laboratory conditions. In addition, the contributors offer an explanation of how behavior modification techniques, derived from this knowledge, can be used for preventive purposes. Because of the social nature of aggression and delinquency, behavior change techniques were principally aimed at modifying environmental influences. The contributions to this volume illustrate how behavioral scientists may aid in the understanding and amelioration of conditions that give rise to violence. Today it can be read and enjoyed in its historical context.