Addresses a fundamental component of planning and implementing a comprehensive underage drinking prevention program -- evaluating the program. This guide on evaluation describes how organizations and coalitions can develop and utilize an evaluation strategy to make their programs successful and effective. Describes the purpose of evaluation as well as the myths and facts about the evaluation. The four stages or types of evaluation are described in detail, including formative, process, outcome and impact. Also provides examples of when each stage should be used. Contains a resource section to assist readers in obtaining additional and detailed information.