Details the wealth of new knowledge about the causes and cures for delinquency and youth violence that has been generated by researchers and practitioners over the past 2 decades, including powerful new models that are dramatically reducing recidivism by youthful offenders and the onset of delinquency by high-risk youth. Examines 2 popular notions: that youth crime is growing worse due to a generation of "juvenile superpredators" and that "adult time for adult crime" should be the basis for juvenile crime policy. Looks in detail at our nation's juvenile justice systems and our varied efforts to prevent delinquency and violence. Includes recommendations.