"Research on the impact of narrow networks is limited, but early studies suggest that several factors affect whether narrow network strategies will succeed. These factors include the way networks are constructed, the characteristics of the broader market in which narrow network plans operate, and whether consumers have the knowledge and tools to make informed choices about coverage. Additional research is needed to help policymakers better understand how to define and develop enforceable standards to measure the adequacy of narrow networks. Research can also help identify the quality considerations to be incorporated into the network design process, the development of network adequacy standards, and the type of guidance that can help consumers understand plan differences when making choices among products."