Evaluation roles used in the Department of Research and Development in the Cincinnati Public Schools are identified and described. These include: project evaluator, local-school evaluator, independent program evaluator, external evaluator and external auditors. The merits of each evaluation role will be discussed as to its relationship with credibility, objectivity, independence and usefulness. The basis for judging the merits of each evaluation role with regard to the above four criteria will be: (1) types of decisions to be made; and (2) safeguards to maximize each of the four criteria. (Author/RC)