Like many other professionals working in the field of violence, psychologists realize the problem of violence is more complicated than many want to believe. Building more prisons or hiring more police officers may contain some violent individuals, but these actions do not prevent violence from occurring in the first place. Volume contributors recognize that violence is affected by psychological, sociocultural, economic, and societal factors. The volume is organized in six parts: (1) etiology of violence; (2) violence among ethnic groups; (3) populations vulnerable to violence; (4) societal influences on youth violence; (5) prevention and treatment interventions; and (6) research and policy recommendations. Specific chapters discuss theoretical and developmental perspectives on youth violence, sociocultural factors in the etiology and prevention of violence among ethnic minority youth, ethnic group violence, and vulnerable populations. Additional chapters consider the media's role in youth aggression and violence, guns and youth, mob violence, interventions for aggressive and antisocial children, and interventions in family violence involving children and adolescents. Research and policy recommendations are offered that focus on the present status of and future directions in psychological research on youth violence and the prevention and treatment of youth violence. References, tables, and figures