Identifying problematic behavior and responding from the point of arrest through correctional intervention/punishment is typically the focus when one considers juvenile justice. This chapter focuses on preventing youthful misbehavior before it initially occurs. Prevention initiatives need to target key risk factors for delinquency such as family factors, peer relationships, school factors, psychological/personality influences, and biological factors. The chapter addresses a wide range of interventions including parent training programs, preschool and educational initiatives, skills training, bullying prevention, mentoring programs, conflict management, and dispute resolution. The focus is on the effectiveness of the prevention initiatives.