Rapid, breakthrough change cannot happen in the field of early childhood unless people, organizations, and systems learn from each other’s successes and failures. This requires a platform for asking and answering questions such as: which interventions work for which populations and why? The Center on the Developing Child facilitates the development of learning communities that provide the means for early childhood innovators to set goals, share results, and cultivate not only leaders, but also new ideas. The following initiatives are examples of the Center’s active learning communities [1].