In 2003, The National Institute on Disability and Rehabilitation Research (NIDRR) funded a Rehabilitation Research and Training Center on Disability Demographics and Statistics (StatsRRTC) at Cornell University‘s Employment and Disability Institute (EDI). The goal of the Center is to ―explore the reliability of existing data sources and collection methods and evaluate ways to improve and expand current data collection efforts‖ (EDI 2008). As a collaborator with the StatsRRTC, Mathematica Policy Research, Inc. (MPR), has been working on a project that identifies the strengths and limitations in existing disability data collection in both content and data collection methodology. The intended outcomes of this project include expanding and synthesizing knowledge of best practices and the extent to which existing data use those practices, informing the development of data enhancement options, and contributing to a more informed use of existing data.