The Laboratory staff reported the unit development and field test activities in their effort to collect, analyze, synthesize, and disseminate new curriculum developments in secondary level social studies to school curriculum decision makers. The audience consisted primarily of social studies teachers and department chairmen. To further refine and evaluate their model information processing system, the staff defined the following unit objectives using the Bloom and Krathwohl taxonomies: 1) Cognitive Performance Objectives: to develop knowledge of programs, comprehension of relationships and implications, application, and evaluation of program information; and, 2) Affective Performance Objectives: to promote use of, and involvement with the unit. 3) The specific unit requirements were: parallel treatment of programs, accuracy, consistency, objectivity, flexibility, timeliness, relevance, uniqueness, and cost effectiveness. After an initial survey of 100 new programs, nine research based American government programs were selected for review in the multi-level unit including: introductory materials, project comparisons, program selection device, and detailed program reports. Three major field tests were conducted between February 1969 and spring 1970. The first was largely non-quantitative; the main and operational field tests were empirical studies with the populations, methodologies, and results enumerated here. It was concluded that the objectives were met. (SBE)