Usability Testing: You are not your user. No matter how good you think you are.
A lesson from Google Buzz: a large sampling isn't always a representative sampling.
Link tags: user_testing
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The WHATWG Blog » Blog Archive » Usability testing HTML5
Hixie has been making changes to microdata in HTML5 based, not on opinion or theory, but on the results of user testing.
five second test - A simple online usability test
The five second test is a simple usability test that helps you measure the effectiveness of your user interfaces.
Card sorting pix
Flickr photo set, AIGA card sorting exercise.