Very good book. It's true that there are some redundancies and the end of the book is a bit sluggish on the aspects of "acting Games"; but the fact remains that the first two thirds are really exciting. In any case, it was extremely helpful. I completely changed my way of making presentations since ... and I must admit that there is a "before" and "after" in terms of efficiency and results. It allows us to ask the right questions and to get away from the famous "single thought Powerpoint".