It’s tempting to think that the people who don’t “get” your site right away probably aren’t your real audience, but it’s just not true. When testing sites, it’s not at all unusual to have people say, “Oh, is that what it is? I’d use that all the time, but it wasn’t clear what it was.”
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.