In this book, Nadler and Hibino provide a very useful adjunct to problem solving and group problem solving literature. But it's not as all-inclusive as they would like us to believe. Their breakthrough thinking process, when used with groups, is very much akin to the action research process, where a group of actors in a situation agree to work together to understand the problem, devise solutions, implement them together, evaluate whether they're working, and if not try something else. _Breakthrough Thinking_ provides a rich level of detail on some of the techniques of action research, including who should be the actors, how to find the solution you're going to try, and how to hang on to the ones you don't try in case you need them later. But there is a lot more to action research than breakthrough thinking, and the authors, in typical American enthusiasm for having found The Answer (an attitude they decry as being anti-breakthrough) propose Breakthrough Thinking as the be-all and end-all of group decision making. The book would be better if they would also provide some pointers to or glimmers of other issues in action research or group dynamics. The book is also ponderously written, with way too many examples and case studies and saying the same thing over and over in different ways. A book about half this size would be much better.