In 2003, Microsoft Corporation commissioned Forrester Research, Inc., to conduct a study to measure the potential market of people in the United States who are most likely to benefit from the use of accessible technology for computers. Accessible technology enables individuals to adjust their computers to meet their visual, hearing, dexterity, cognitive, and speech needs. It includes both accessibility options built into products as well as specialty hardware and software products (assistive technology products ) that help individuals interact with a computer. The goals of this study were to identify the range of physical and cognitive abilities among working-age adults and current computer users in the United States, the types of difficulties and impairments that limit the scope of activities and their degree of severity, and the number of people who could potentially benefit from using accessible technology. This information, coupled with aging population trends, can help to explain the aging population's impact on computer use and need for accessible technology.