This brief identifies the steps necessary to realize an integrated system of care, reviews two current approaches, and makes recommendations--including specifying policy reforms that would promote interagency collaboration, integration, service delivery, and improved outcomes for California's children, both with and without disabilities. As a full commitment from the state administration is necessary to realize the proposed solutions at scale, this brief recommends the formation of a statewide interagency leadership council that has legitimacy, decision-making authority, and accountability across state and local policy and administrative levels. We also present recommendations for integrating California's many child-serving agencies and organizations that simultaneously serve children and families into a "Whole System" approach.