Specific evaluation design is a non trivial problem which must be developed through a set of procedures involving considerable study of the enterprise to be evaluated. Three criteria to be considered when an evaluator provides data for a decision maker are: (1) the percentage of the evaluation data that are actually used by the decision maker; (2) the percentage of the decision maker's decisions that are made, in part, with the use of the evaluation data; and (3) the degree to which the data is utilized in the most important decisions, even where all decisions are not made using the evaluation data. These criteria have been named efficiency, completeness, and focus, respectively. Evaluators should avoid errors, and prefer operational to non operational techniques. Evaluator/decision maker interaction patterns should be incorporated into the evaluation design. (Author/BJG)