For thso working on website and app UIs, UserTesting.com has released a free ebook on issues and assumptions we make plus best practices from big boys including Google, Apple, Amazon, Ebay <a href="http://downloads.usertesting.com/white_papers/Lessons_Learned_from_Watching_200000_User_Testing_Videos.pdf">http://downloads.usertesting.com/white_papers/Lessons_Learned_from_Watching_200000_User_Testing_Videos.pdf</a><br>
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