Influence guarantees two things: Readers will never say yes again when they really mean no, and they'll be more persuasive than ever before.Influential Dr. Cialdini's book is highly readable, thought provoking, and occasionally frightening. His insights into some of the most celebrated (and notorious) experiences and experiments in mass psychology (such as the Milgram project and the Kitty Genovese case) are worth the price of the book alone. But it is Dr. Cialdini's categorizing of the elements of mass psychology and the tools of persuasion that stay with the reader long after the book is back on the shelf. Highly recommended.