Web developers should not make assumptions about the target audience and part of the web development process includes determining the needs of the end user. When it comes to usability, there are four main disability categories that must be considered when designing a website: visual, hearing, mobility and cognitive. These disabilities inhibit an individual's ability to use the web one way or another.
We are not qualified to pass judgement on people with disabilities, but there are standards that we must follow as web developers. What web design techniques would you use to help a user with these disabilities? What techniques might have the greatest impact on your website and why?