If your audience is split between clearly defined groups with very divergent interests and needs, then you need to test users from each group at least once. If you’re building a university site, you recruit two students, two professors, two high school seniors, and two administrators.

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Don’t make me think

Being an expert in online usability Krug gathered his experience in a wonderful book. This summary of key thoughts will help you to remember most important principles and laws.

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