This is a continuation of "Funding of Assistive Technology to Make Work a Reality" (Work and AT), Article # 3 in this Policy and Practice Brief Series. This article will review the provisions of the Americans with Disabilities Act (ADA), with a particular emphasis on how the ADA can be used to ensure that a person with a disability has access to needed AT to do the job, or to ensure the AT user has access to the job site. Once again, the author and his colleagues are writing this for a primary audience of individuals who work for either a Benefits Planning, Assistance and Outreach (BPA&O) project or a Protection and Advocacy for Beneficiaries of Social Security (PABSS) program, both of which are mandated to serve individuals with disabilities who receive either SSI or Social Security Disability Insurance (SSDI) benefits. They assume that this article will also be distributed to many SSI and SSDI beneficiaries, their families, and the agencies that serve them. Accordingly, this article will not be overly technical. However, it will review the major Supreme Court cases interpreting the ADA to date, in at least some detail. The reader interested in more specific, Circuit court decisions interpreting the ADA, is referred to the Neighborhood Legal Services website, for a summary, by Circuit, of many of these decisions. Additional ADA-related resources and technical supports are available by region through the network of ADA & IT Centers. (Contains 134 footnotes.) [For related report, "Funding of Assistive Technology to Make Work a Reality. Policy & Practice Brief #3," see ED537109.]