To ensure their readiness to participate in health homes and ACOs, providers of mental health and substance abuse services are urged to undertake a series of steps in four broad areas. First, it is important to prepare for participation in the larger health care field, which involves identifying community partners and building relationships, especially with primary care; developing competency in team-based care, particularly health homes; and instituting a measurement-based approach to care, such as by incorporating standardized clinical assessment tools into routine service delivery. Because ACOs and health homes seek to partner with “high-volume” specialty providers, mental health and substance use providers are advised to gather data on the population served and increase staff skills and knowledge in population health management, including wellness, prevention, and disease management approaches.