This document discusses adaptive challenges and the importance of adaptive learning skills for collective impact efforts to successfully address complex social problems. It defines adaptive challenges as problems where there are no clear solutions and learning is required. Collective impact aims to guide communities through adaptive learning processes to solve adaptive challenges. However, many collective impact efforts fail because they lack certain adaptive learning skills. The document identifies three key adaptive learning skills needed: systems thinking to identify high leverage intervention points, conversational capacity for open dialogue across boundaries, and improvisational or "yes to the mess" learning to adapt solutions along the way. Developing these skills can help communities learn faster and work together to effectively address adaptive challenges.