This is a superb book aimed at helping developers design products and systems that people really need and want. Nontheoretical and lots of fun, this is destined to become another Weinberg classic. Likening the requirements process to a process of exploration, the principles described apply wherever people design and build products for other people. Topics include ambiguity and ambiguity metrics, techniques for generating ideas, right-brain methods, conflict resolution, reaching agreements, and user satisfaction tests.