whether a software's functions can be executed from the keyboard, or whether they require the use of a mouse, because keyboards are usable by a wider spectrum of people. Because colorblindness is common, another issue is whether the device or software communicates necessary information only by differences in displayed color. Because not all users can hear, another issue is whether the device or software communicates necessary information in an auditory way. If the product can be configured to the user's preferences on these dimensions, that is usually considered a satisfactory adaptation to the Section 508 requirements. One challenge to the adoption of open-source software in the U.S. government has been that there is no vendor to provide support or write a VPAT, but a VPAT can be written by volunteers if they can find the necessary information. See also Computer accessibility Section 504 of the Rehabilitation Act Universal usability Web Content Accessibility Guidelines Web accessibility References Reuters, T. (2011). Rehabilitation act. Retrieved from Castro, I. The U.S. Equal Employment Opportunity Commission, (2000). Policy guidance on executive order 13164: establishing procedures to facilitate the provision of reasonable accommodation Weaver, T. Office of Governmentwide Policy, (2011). Section 508 laws External links CITES/DRES Web Accessibility Best practices United States Access Board the Federal Agency responsible for Section 508 technical standards Section 508 Checklist from WebAIM.org USPS AS-508-A, Section 508 Technical Reference Guide in HTML Format Federal Register December 2000 Section 508 Electronic and information technology accessibility standards Federal Register April 2005 Section 508 related Federal Acquisition Rules Section508.gov - free 508 training. buyaccessible.gov/ - the place for Section 508 procurement assistance WCAG & Section 508 accessibility - The basic Section508 and WCAG requirements [https://www.boia.org/ultimate-guide-to-web-accessibility/ The ultimate guide to website accessibility for Section 508 and WCAG 2.1 A/AA. Web accessibility United States federal civil rights legislation Disability legislation 1973 in law Accessible Procurement