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The document discusses user experience testing at different stages of product development. It emphasizes the importance of understanding users' mental models through observation and interviews rather than asking users directly. Prototyping and testing designs with real users early is recommended to get feedback. Usability testing basics include setting goals, testing with representative users and tasks, observing carefully, and analyzing results. The document also addresses mobile testing, analytics after launch to learn from user data, and maintaining a lean process focused on learning about users.Read less