The Adult College Completion Network--funded by Lumina Foundation and facilitated by the Western Interstate Commission for Higher Education (WICHE)--brings together and supports entities working to increase college and certificate completion by adults with prior postsecondary credits but no degree. The network was founded in part on the premise that improving outcomes for such individuals would require robust collaboration among diverse stakeholders: the workforce system, state higher education agencies, postsecondary institutions, businesses and employers, local governments, community-based organizations, and others. This brief provides examples and research that can help stakeholders working in this sphere to forge new relationships and strengthen current partnerships. It begins with a look at general research on the coordinated delivery of public services to identify some of the common characteristics of highly effective collaborations. Then, it focuses on three noteworthy efforts: a consortium to increase degree attainment by adults in Georgia, a citywide effort to increase degree attainment in Louisville by 2020, and a healthcare collaborative designed to meet workforce needs in the Cincinnati area.