The American Community Survey (ACS) conducted by the Census Bureau establishes the first-ever set of standard questions about disabilities to use across surveys. The ACS is a nationally representative self-report survey that includes six questions to assess the presence and severity of hearing or vision impairments, physical or mental disabilities, self-care problems, and limitations to independent living. It defines disability in terms of the Americans with Disabilities Act, and is intended to produce an unbiased picture of the population with disabilities. Prior to 2008, federal surveys used different sets of questions to estimate national disability prevalence, which . . .