Usability
Accessibility
Readability
The goals of
usability is:
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To present the information to the user in a clear and concise way.
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To give the correct choices to the users, in a very obvious way.
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To remove any ambiguity regarding the consequences of an action e.g.
clicking on delete/remove/purchase.
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To put the most important thing in the right place on a web page or a web
application.
Design a clear and simple navigation system.
A good navigation system should answer three questions:
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Where am I?
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Where have I been?
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Where can I go?
source:
http://www.netmechanic.com/news/vol7/design_no4.htm
http://en.wikipedia.org/wiki/Web_usability