The use of narrow provider networks in health insurance plans is a cost containment strategy that has gained popularity of late. This report is based on a December 2014 meeting of AcademyHealth’s Research Insights project that brought leading academic researchers together with policy audiences to discuss the effectiveness of existing and emerging network design strategies and the potential for policies to ensure consumer access to high-quality care. Among its conclusions, the report underscores the need to develop enforceable standards to measure network adequacy as well as better guidance that can help consumers understand plan differences when making choices among products.