This document summarizes Belbin's team role theory, which identifies 9 common team roles based on behavioral tendencies. It describes each role's strengths, weaknesses, and how they contribute to team success at different project phases. An effective team needs a balance of roles like Shapers, Coordinators, Completers. Understanding roles helps avoid conflicts from competing styles and identify gaps to improve dynamics. Team role assessments provide insights into individual fit and how members can work together most productively.