#23514
It is advisable to be aware of the predominant conventions used on the Web. As Jakob Nielsen writes in the November 14, 1999 issue of his Alertbox, 'No website is seen in isolation: users come to your site expecting things to work the same way they are already used to.'
Atkisson, Heidi. University of Washington-Seattle (2003). Design>Web Design>User Centered Design
#23005
World Wide Access: Accessible Web Design
This video presentation shows how to make web pages accessible to people with disabilities. It is particularly useful for self-instruction or group training for people who design and support websites and/or teach web design classes. The accompanying publication provides details and resources on this topic. The presentation is open-captioned and audio-described to assure access to the content for viewers who are deaf or blind, respectively.
University of Washington-Seattle (2003). Design>Web Design>Accessibility>Video
#34148
Evaluating Existing Audio CAPTCHAs and an Interface Optimized for Non-Visual Use 
Audio CAPTCHAs were introduced as an accessible alternative for those unable to use the more common visual CAPTCHAs, but anecdotal accounts have suggested that they may be more difficult to solve. This paper demonstrates in a large study of more than 150 participants that existing audio CAPTCHAs are clearly more difficult and time-consuming to complete as compared to visual CAPTCHAs for both blind and sighted users. In order to address this concern, we developed and evaluated a new interface for solving CAPTCHAs optimized for non-visual use that can be added in-place to existing audio CAPTCHAs. In a subsequent study, the optimized interface increased the success rate of blind participants by 59% on audio CAPTCHAs, illustrating a broadly applicable principle of accessible design: the most usable audio interfaces are often not direct translations of existing visual interfaces.
Bigham, Jeffrey P. and Anna C. Cavender. University of Washington-Seattle (2008). Articles>Accessibility>Security>Web Design
