An evaluation of the MACOS social studies curriculum program was conducted during 1969-70 in six elementary schools. Three schools were randomly chosen to participate in the MACOS program while three others served as a comparison group. Teachers of the former schools received training in the appropriate procedures for utilizing the relevant methods and materials to implement that program while teachers in the latter comparison group continued with their regular social studies program. Nineteen comparisons were made after the MACOS program had been conducted for one school year to determine how well students in the MACOS program learned material specific to that program; how well they learned those elements which are common to both the MACOS and the regular program; and how the attitudes of students and teachers were affected by participation in the MACOS program. The results indicate that the material specific to the MACOS program and the common elements of both programs learned better by those in the MACOS program. In the area of attitudes, the students in the MACOS program had a more positive view of themselves as social studies students' and teachers perceived these students as more interested in social studies. Of the 19 comparisons, seven of the differences were statistically significant, and all seven of these comparisons favored the MACOS group. (Author/SJM)