The NanoRelease Project is intended to support the development of methods to understand the release of nanomaterials used in products. To do this, the Project will: (1) examine full life cycles of nanomaterials in products; (2) work through specific release scenarios at key exposure points of the life cycle; (3) organize existing material characteristics data and measurement methods for those release scenarios; (4) develop a “state of the science” report for release measurement; and (5) carry out inter-laboratory testing to promote improvements, standardization, and widespread use of methods. The NanoRelease Project completed Phase 1 in 2011, resulting in the selection of multi-walled carbon nanotubes (MWCNT) in polymers as the first material to be evaluated through inter-laboratory studies of methods. In Phase 2, three Task Groups of more than 40 experts are evaluating: (1) measurement methods; (2) the effect of materials selected on release rates; and (3) identifying the key exposure/release scenarios. Each Task Group will produce a white paper on their respective topic. Phase 3 is scheduled to begin in late 2012, with a “round robin” approach to inter-laboratory testing using a reference nanomaterial-matrix and positive controls for the study of MWCNT released from selected polymers. The NanoRelease Project is organized by Dr. Richard Canady of the ILSI Research Foundation, and is supported by the U.S. Environmental Protection Agency, Environment Canada, Health Canada, the American Chemistry Council, the Society of Chemical Manufacturers & Affiliates, the National Institute of Standards and Technology, the Adhesive and Sealant Council, and the American Cleaning Institute.