Book excerpt: Policies that foster the transition towards a more circular economy are gaining significant traction. Such policies are essential for a sustainable, low-carbon, resource-efficient and competitive economy. These developments bring about demands for reliable information to track progress and gauge results as well as for indicators that speak to policymakers and the public at large. This report presents a conceptual framework and indicator set to monitor progress and inform circular economy policies. It is designed to support OECD work on circular economy and provides a source of inspiration for countries seeking to build a coherent circular economy monitoring framework.