U.S. government agencies compile a thorough set of statistics on populations defined by age, race, ethnicity, and marital status—but not by disability status. Therefore, working-age people with disabilities are often overlooked in discussions of the latest statistics on employment, income, poverty, and other measures of the status of a particular population. This book helps remedy this situation by providing a systematic review of what current statistics and data on working-age people with disabilities can and cannot tell us, and how the quality of the data can be improved to better inform policymakers, advocates, analysts, service providers, administrators, and others interested in this at-risk population.