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Since June 2001, Federal regulations require that U.S. government Web sites and other software developed by or for the U.S. Government provide comparable access to the information for all users. Computer users who have visual and/or other disabilities are entitled to have the same access as users who do not currently have any disabilities.
Accessibility is a subset of usability. Accessibility guidelines have several checkpoints that address more general usability, such as developing a logical tab order, dividing large information blocks into more manageable groups, and using the clearest and simplest language appropriate. Even if the application complies with the law, it still may not be usable, as the Census Bureau’s Usability Lab has found in other testing. Both usability and accessibility testing need to be done to identify problems that actual users may have.
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