Encouraging a broader view of educational evaluation by emphasizing systematic means for the collection and analysis of a wide variety of types of evaluation data at all educational levels, an extension is proposed to the evaluation rationale formulated several years ago by Ralph W. Tyler. The revised model, patterned after the "multiform organismic system of assessment" devised by the Office of Strategic Services, develops a principle of multiple measurements, placing basic data (test scores, teacher ratings, etc.) in a holistic spectrum consisting of many sorts of objective and subjective data. A "behavior dictionary" of measurable indicators of educational achievement is being developed as a tool for the analysis of quantitative evidence. The model, measuring cognitive, affective, and habitual behaviors in class and school situations, is being developed for initial application at the elementary school level. (JK)