This document discusses communities of practice and learning. It addresses key dimensions and processes of communities of practice including sponsorship, meaning, domain, identity, participation, learning together, and boundaries. It also outlines different learning activities that can take place within a community of practice such as exchanges, building shared understanding, and joint projects. Leadership roles in communities are discussed including coordinators, subgroup leaders, and subject matter experts. The lifecycle and evolution of a learning partnership within a community of practice is also addressed.