The federal Beacon Community Program has awarded 17 localities across the United States with three-year grants to build and strengthen their health information technology infrastructure and data exchange capabilities, with the goals of improving care coordination, reducing costs, and accelerating development of accountable care systems. With the understanding that success will depend in part on rapid learning and knowledge dissemination, the project team will establish a learning network for Beacon Communities to help them demonstrate the impact of their community-level health system reforms and to disseminate this information rapidly to local, state, and federal stakeholders. More broadly, this work is expected to inform policymakers about progress in spreading accountable care systems.