General guidance is offered in the planning and implementation of community-based strategies for the prevention of tobacco use among youth. Ideas and data are organized by means of the Prevention Enhancement Protocols System (PEPS), which is a systematic process for evaluating prevention research and practice evidence, assessing the strength of that evidence, and then developing recommendations for practice. Chapter topics are: (1) "The Problem of Tobacco Use among Youth," covering historical context, epidemiology, consequences, and risk and protective factors for tobacco use among youth; (2) "Community-Based Prevention," including a review of community issues, a rationale for programs, a sociological framework for tobacco control, and a review of programs; (3) "Analysis and Recommendations," which discusses the evaluation of prevention approaches, presents six major approaches, makes recommendations, and reviews research evidence and practice cases; (4) "Tobacco Prevention Intervention: Implementation Action Plan," which provides a conceptual framework for implementation, also covers issues about applications, cost, measurement, and other considerations. Appendixes are: "PEPS Participants,""Research and Practice Search Protocols,""Methodology for Arriving at Recommendations,""Collateral Research,""Abbreviations and Glossary," and "Resource Guide." (EMK)