Usability and accessibility testing of the Internet form for the 2005 National Census Test (NCT) took place in May, 2005. The purpose of usability testing was to identify any aspects of the user-interface design that might detract from the success and satisfaction of Internet respondents during the 2005 NCT. The purpose of the automated accessibility testing was to identify any violations of the Federal accessibility regulations (Section 508 of the Rehabilitation Act as amended in 1998). The purpose of testing for accessibility with actual participants was to identify aspects of the user-interface tagging that might be technically accessible but still awkward or difficult for users with disabilities in the 2005 NCT.