With the theory that social and personal values influence the conduct of evaluation studies in education, the author discusses the impact of two major sources of such values--contextual factors, including political, social and organizational influences; and the terminology, models, and personal values of evaluators. Alternative purposes for an…

A replicable process for improving instruction through the consistent use of student data collected before, during, and after instruction is proposed. A rational analysis of different types of error rates (theoretical, base, posttest, instructional) and discrimination indices (base, posttest) leads to a set of rules for identifying test items and…