Since its inception, the Office of Juvenile Justice and Juvenile Delinquency Prevention (OJJDP) has initiated and supported a broad range of research, demonstration, evaluation, and training and technical assistance initiatives to prevent and reduce gang crime. A central focus of these anti-gang efforts is to support community endeavors to provide youth with a safe environment in which to grow up. As part of that comprehensive initiative, OJJDP launched the Gang Reduction Program in 2003. The multimillion-dollar initiative was designed to reduce gang crime in targeted neighborhoods by incorporating research-based interventions to address individual, family, and community factors that contribute to juvenile delinquency and gang activity. The program leveraged local, State, and Federal resources in support of community partnerships that implement progressive practices in prevention, intervention, suppression, and reentry. Best Practices To Address Community Gang Problems: OJJDP's Comprehensive Gang Model provides communities considering implementing the comprehensive gang model with critical information to guide their efforts. The Report describes the research that produced the model; outlines best practices obtained from practitioners with years of experience in planning, implementing, and overseeing variations of the model in their communities; and presents essential findings from evaluations of several programs that demonstrate the success of the model in a variety of environments. OJJDP commends the progress made in the demonstration sites, and we wish them continued success. We remain committed to assisting other communities in assessing their gang problems and developing a complement of anti-gang strategies and activities to address this complex challenge. This Report provides guidance for communities that are considering how best to address a youth gang problem that already exists or threatens to become a reality. The guidance is based on the implementation of the Comprehensive Gang Model (Model) developed through the Office of Juvenile Justice and Delinquency Prevention (OJJDP), U.S. Department of Justice (DOJ), and tested in OJJDP's Gang Reduction Program. The Report describes the research that produced the Model, notes essential findings from evaluations of several programs demonstrating the Model in a variety of environments, and outlines "best practices" obtained from practitioners with years of experience in planning, implementing, and overseeing variations of the Model in their communities. The Model and best practices contain critical elements that distinguish it from typical program approaches to gangs. The Model's key distinguishing feature is a strategic planning process that empowers communities to assess their own gang problems and fashion a complement of anti-gang strategies and program activities. Community leaders considering this Model will be able to call on the OJJDP Strategic Planning Tool at no cost (http: //www.iir.com/nygc/tool/default.htm). OJJDP's Socioeconomic Mapping and Resource Topography (SMART) system is another online resource available through the OJJDP Web site (go to http: //www.ojp.usdoj.gov/ojjdp, and select "Tools"). The main section of the Report presents best practices for the Comprehensive Gang Model and highlights results of a survey and a meeting of practitioners regarding their experiences in implementing the Model. This section contains specific practices that work best in a step-by-step planning and implementation process for communities using the Comprehensive Gang Model framework and tool