This document discusses positive interdependence in project groups. It summarizes research on teamwork strategies, cooperative learning principles, and group dynamics. It then describes a 3-year study of 24 group projects involving 71 students from various backgrounds working together. The students chose their own topics and groups. They utilized teamwork strategies like parallel, sequential, and reciprocal work. They also applied cooperative learning principles such as positive interdependence, accountability, and social skills. Through applying these frameworks, the students were highly motivated and achieved strong results in their presentations despite coming from diverse backgrounds.