In this article, the authors highlight key elements of their new model for developing educators' capacities, as well as key takeaways about the potential of supporting adult development. Focusing on the five elements -- Theory, Culture, Pillar Practices, Feedback, and Sustainability -- of their developmental model for building capacity can foster growth in each of us and in our most complex organizations. How we care for, understand, and relate to one another, whether we're talking about students or adults, is all connected. It all matters -- and it all depends on the internal capacities we bring to the work. Adult development isn't just a great tool for school development. It is school development.