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Web Usability and Accessibility Heuristics
Web usability can be difficult to define with specific rules, but these heuristics or rules of thumb will help you determine whether you are creating accessible and usable sites or not.
heuristics
Definition of the term heuristics as it relates to Web design and development
Heuristics for User Interface Design
If you want to create a useable Web page, these ten heuristics by Jakob Nielsen will help you evaluate and adjust your site.
Site Usability Heuristics for the Web
A clarification of Jakob Nielsen's ten heuristics.
How to Conduct a Heuristic Evaluation
If you're trying to find out whether your design is working from a usability standpoint, this article will help you. It is very dense, but has a lot of great information.