Volume Three of the Biomedical and Behavioral Research Scientists study contains five commissioned papers. The first paper, "Evaluating the National Research Service Award Program (NRSA): A Review and Recommendations for the Future," (Georgina M. Pion) reviews previous evaluation activities of the NRSA program and proposes an agenda describing the types of evaluation activities that should be carried out over the next 5 years. The second paper, "Productivity" (Helen Mofer Gee) discusses the complexities, issues, and problems in the use of specific productivity measurements. The third paper, "Health Services Research Personnel: Demand, Supply, and Adequacy of Training Resources" (Elizabeth McGlynn) describes the training of individuals engaged in health services research, the various pathways used to produce these researchers, the current levels of support for training, and future events that might affect labor demand. The fourth paper, "Training of Physician/Scientists" (Lloyd H. Smith, Jr.) addresses the role of physician/scientists in conducting the nations's biomedical research program and how national policy should be shaped to ensure that a sufficient number of physician/scientists are available in the future. The fifth paper, "Biomedical/Behavioral Cohort Model: A Technical Paper" (Joe G. Baker) provides a descriptive overview of a model used to project the future labor market for biomedical and behavioral scientists. (GLR)