The Joint System Social Studies Project provided students from the public and parochial school systems with an innovative ethnic studies curriculum developed during joint staff meetings. Intersystem cooperation and communication was encouraged through this joint undertaking. Twenty public and parochial school teachers participated in monthly staff development meetings for training in ethnic and racial cultures and in current social studies approaches. A curriculum guide was developed and instructional materials were produced and identified. The ethnic studies curriculum was implemented in four elementary schools, one junior high school and four senior high schools from each system. Approximately 700 students participated in the project each year. A pre- and post-test attitude survey taken during the third year of the project revealed that there was a significant change in student attitude toward ethnic groups. No significant change was found in student attitude toward racial groups or toward students from the other system. Participating students made significant gains in cultural knowledge. However, few joint classes' needed to stimulate student interaction took place. Increased cooperation and communication between teachers from the public and parochial systems was noted. Resources common to both systems were effectively utilized. (Author/RC)