The study describes the use, popularity, and effectiveness of selected social studies curriculum project materials (CPMs). Five multistate surveys identified 11 CPMs which were judged to be widely used and therefore served as the basis for the study. These included materials from the High School Geography Project, Anthropology Curriculum Study Project, the Carnegie-Mellon Slow Learner Project, and the Asian Studies Curriculum Project. All of the CPMs were for secondary school use. As a first step in the study, all CPMs were classified on the basis of available data as either high or low with regard to use, user liking, and effectiveness. Then they were analyzed according to the Annehurst Curriculum Classification System (ACCS), which provides a means of classifying curriculum materials on dimensions that parallel learner characteristics (i.e., experience, motivation, creativity, verbal expression). Results indicated that the CPMs have had a moderate but positive impact with regard to use by subject area, user liking, and effectiveness in promoting learning. The CPM characteristics tend to be positive on the cognitive and social and low on the perceptual-motor ACCS dimensions. Tables are included which identify the 11 CPMs in the study and show statistical data from the analyses. (Author/AV)