Usability means that web sites are easy to use. Both are important, but accessibility will become even more of an issue for federal employees under the Section 508 proposal. In the grand scheme of things, good web design is cool. Accessibility means that web sites are barrier-free to everyone and open to individuals regardless of their disabilities.
Usability means that web sites are easy to use.
Both accessibility and usability are powerful indicators of an understanding of universal design. They reflect positively on web developers and their clients, as well as lead to increased numbers of satisfied web customers. While accessibility may be conceptually linked to disability, accessibility also means that people with older modems and earlier versions of browsers can use the web site equally as well as people with the latest hardware, software, and Internet connections. Consider building ramps, which are intended for people in wheelchairs. Those who have difficulty navigating steps or who are pushing a baby-stroller can also take advantage of the ramps.