On September 20, 2013, the Organization for Economic Cooperation and Development (OECD) announced a recommendation that its Member Countries apply existing regulatory frameworks to manage risks associated with manufactured nanomaterials. The Recommendation, approved on September 19, 2013, expands the scope of the Mutual Acceptance of Data (MAD) in the Assessment of Chemicals to include nanomaterials. Since 2006, OECD has been working to develop approaches for addressing risk assessments for manufactured materials. A review of the Recommendation will occur in three years to assess how it has been implemented in OECD Member Countries.