This digest addresses the role of evaluation and its basic logic, and provides a description of how the field is structured. In order to reach evaluative conclusions it is usually necessary to establish or identify factual promises and value premises. To obtain the required kind of overall evaluative conclusion, it is typically necessary to combine all the premises, of which there may be several hundred, through what is called the "internal synthesis process." From psychology, evaluators frequently encounter premises about maturational rates, cognitive processes, or leadership research. Eight applied fields of evaluation are of particular importance. The "Big Six" are the fields of program, personnel, performance, policy, proposal, and product evaluation. The "Super Two" are interdisciplinary evaluation, the evaluation of entities that are the currency of a discipline's economy, and meta-evaluation, the evaluation of evaluations themselves. (SLD)