This report is designed to help community-based organizations, youth-serving agencies, and the criminal justice and juvenile justice systems recognize their common stake in supporting healthy and positive youth development, both to revitalize their neighborhoods and to control crime. It focuses on: "The Basics: Youth, Crime and Community Development"; "Effective Community Responses: 20 Strategies to Reduce Youth Crime and Steer Young People toward Success (community youth development, enlightened action for troubled youth, and community-focused crime prevention); and "Putting it All Together" (learning from Boston and from other cities and getting started in one's community by organizing a community youth-crime prevention task force, analyzing the community's youth-crime challenge, inventorying and mapping the community's delinquency prevention and youth development efforts, learning what works in youth-crime prevention, partnering and planning clear and measurable goals, raising funds and implementing the community anti-crime plan, and monitoring, revising, and sustaining the effort). (SM)