The story of usability is a perverse journey from simplicity to complexity. That’s right, from simplicity to complexity—not the other way around.
If you expect a “user-friendly” introduction to usability and that the history of usability is full of well-defined concepts and lean methods, you’re in for a surprise. Usability is a messy, ill-defined, and downright confusing concept. The more you think about it—or practice it—the more confusing it becomes.