Principles are critical in the development of policy. They represent the highest level of consensus about the direction of policy and provide a guide in developing policy and a means of evaluating the results of implementation. This paper first proposes that Extended Producer Responsibility (EPR) is itself a broad principle for product-oriented environmental policy, which can supplement existing principles, such as the Polluter Pays Principle. Second, the experiences with EPR-based policies and the discussions in the OECD EPR workshops provide the basis for a proposed set of principles for the application of EPR.