In June 2020, the National Governors Association (NGA) launched the SUD Systems of Care Learning Collaborative, in order to further state efforts in developing and implementing evidence-based interventions that link individuals affected by substance use disorders to care and treatment. NGA engaged TAC as a subcontracted partner to offer states specific subject matter expertise that would complement NGA expertise. State teams worked with NGA and TAC staff to refine their goals and create action plans through research; information and data gathering; cross-agency discussions; and coordination of resources. Self-identified outcome and project evaluation assessments were conducted regularly, and this information, along with data from regular assessments conducted by NGA and TAC staff, was used to develop a resource for policymakers in other states who may be working on improving their own systems of care: State Efforts to Improve the Continuum of Care for Substance Use Disorder and Opioid Use Disorder — Lessons Learned from the National Governors Association Substance Use Disorder Learning Collaborative in Six States.