A workshop that brought together university-based researchers, members of the international official statistical community, and other interested user communities was held on July 31, 2009, the Friday before the 2009 Joint Statistical Meetings in Washington DC at the U.S. Census Bureau's Headquarters building in Suitland, MD. The purpose of the workshop was to discuss and critique newly created public-use micro-data files that are based on the concepts of “synthetic data” and “partially synthetic data.”