『Don't Make Me Think』要約

Steve Krug's "Don't Make Me Think" is a concise, practical guide to web usability, first published in 2000 and revised in later editions. Krug, a usability consultant, argues that good web design should be self-evident, so users can navigate without expending mental effort—hence the title's core principle. The book's central metaphor is that users don't read pages; they scan, satisfice, and click the first plausible option. Krug's First Law of Usability states that a page should be obvious enough that users never have to puzzle over what to do. The book is structured around concrete heuristics rather than abstract theory. Krug introduces the "trunk test," a quick method for evaluating whether a page's navigation and identity are clear when viewed out of context. He explains conventions like the "big honking border" and the importance of persistent global navigation. A recurring theme is that users form mental models and expect websites to behave like others they've used; breaking conventions creates friction. Krug also discusses the "reservoir of goodwill," noting that users start with patience that erodes with each frustrating interaction. He advocates for low-cost, frequent usability testing with just three users per round, arguing that small tests reveal most major problems. The book's later sections cover accessibility, mobile design, and the process of conducting DIY usability tests. Throughout, Krug emphasizes simplicity, clarity, and removing question marks from users' minds. The tone is informal, with illustrations and humor, making it a foundational text in user experience and interface design.