Steve Krug's Don't make me think is obviously there on every design professional and student's must-read books list, just like design of everyday things is. But in my limited experience, no one I know has read "don't make me think". The proverbial motto among designers-this is a ludicrous generalization of course-being "don't make me read". The author is a huge fan of Amazon, and rightly so. Amazon has done a shit ton of usability testing. As an aside, I wish Amazon also did some usability testing on Goodreads because the site is practically unusable.The book is focused on simple, informal, small-sample, do-it-yourself usability testing (sometimes known as discount usability testing). The book is not about qualitative, quantitative, summative, formative, formal, informal, large sample, small sample, comparative tests, benchmarking tests, etc. For that you can contact your organization's UX researcher. The book's main thrust is to equip designers in small teams to conduct usability testing especially when resource constraints are significant.