Identify the special needs or requirements, if any, for each audience group. For example, people with disabilities may be unable to access your web site, or do so only with great difficulty.
The outcome of this exercise is a collection of user experiences that match the site goals. Also, remember the expectations of ALL users:
They want useful content;
They want easy and clear access to that content;
As a general rule, they are impatient; that is they are reluctant to wait beyond a reasonable time (12 seconds and shrinking) for content to display;