The U.S. Environmental Protection Agency’s (EPA) May 5, 2008, Unified Agenda includes an item regarding the Nanoscale Materials Stewardship Program (NMSP), which is a voluntary program that EPA established to assemble existing data and information from manufacturers and processors of certain nanoscale materials. The notice states that, under the Toxic Substances Control Act (TSCA), EPA has the authority to require the development of data necessary for risk assessment when statutory findings concerning (1) production volume and exposure/entry into the environment or (2) potential hazard can be made, and to prevent and eliminate unreasonable risk of injury to human health and the environment. On January 28, 2008, EPA announced the NMSP. According to the Unified Agenda notice, EPA intends to publish in March 2009 an interim evaluation of the NMSP, and a final evaluation of the NMSP, “including next steps,” in April 2010.