Preface GAO assists congressional decisionmakers in their deliberative process by furnishing analytical information on issues and options under consideration. Many diverse methodologies are needed to develop sound and timely answers to the questions that are posed by the Congress. To provide GAO evaluators with basic information about the more commonly used methodologies, GAO's policy guidance includes documents such as methodology transfer papers and technical guidelines. This methodology transfer paper on prospective evaluation synthesis focuses on a systematic method for providing the best possible information on, among other things, the likely outcomes of proposed programs, proposed legislation, the adequacy of proposed regulations, or top-priority problems. The paper uses a combination of techniques that best answer prospective questions involving the analyses of alternative proposals and projections of various kinds. As GAO receives more requests for assessments about the implications of future occurrences, evaluators should find this systematic approach a beneficial tool to facilitate them in their work. The present transfer paper is one of a series of papers issued by the Program Evaluation and Methodology Division (PEMD). The purpose of the series is to provide GAO evaluators with guides to various aspects of audit and evaluation methodology, to illustrate applications, and to indicate where more detailed information is available.