This paper describes the research and evaluation efforts of the Navy Substance Abuse Prevention Program at the University of Arizona. The importance and usefulness of formative and summative evaluations are discussed and specific evaluation tasks are identified. The first of these tasks is associated with personnel selection; the functions and qualifications of various personnel (site screeners, facilitators, site coordinators, trainers, and students) are reviewed. The second task considered is personnel training. The training of screeners, facilitators, and site coordinators, and observation training are discussed. The third task described involves the intervention process. Viable sources of program mediation are discussed including facilitator characteristics, curriculum, classroom environment, and participant characteristics. The final evaluation task discussed is participant change. The primary goal of the program intervention is defined as change in drug and alcohol related behavior in the target population. The components described in this section focus on establishing the extent to which participants' knowledge, attitudes, and behaviors are altered as a direct result of participation in the program. Five summative studies currently in progress are briefly outlined. (NRB)