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Rocket Surgery Made Easy: The Do-It-Yourself Guide to Finding and Fixing Usability Problems (Voices That Matter)
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Don't Make Me Think, Revisited: A Common Sense Approach to Web Usability (Voices That Matter)
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Nothing important should ever be more than two clicks away
Steve Krug • Don't Make Me Think: A Common Sense Approach to Web Usability, 2nd Edition

“Don’t make me think!” For as long I can remember, I’ve been telling people that this is my first law of usability. It’s the overriding principle—the ultimate tie breaker when deciding whether a design works or it doesn’t.
Steve Krug • Don't Make Me Think, Revisited: A Common Sense Approach to Web Usability (Voices That Matter)
Your objective should always be to eliminate instructions entirely by making everything self-explanatory, or as close to it as possible. When instructions are absolutely necessary, cut them back to a bare minimum.
Steve Krug • Don't Make Me Think: A Common Sense Approach to Web Usability, 2nd Edition
When I enter a new site, after a quick look around the Home page I should be able to say with confidence: Here’s where to start if I want to search. Here’s where to start if I want to browse. Here’s where to start if I want to sample their best stuff.