This book focuses on the stimuli (inputs/old ideas) and effective capaturing of responses (outputs/creative ideas) vs most other books about creativity focus on the thinking process, like mindmapping, six hats, thinking toys, etc. Thus, it directs to a total different path of how we build an environment to boost creativity. My analogy is no matter what thinking process you introduce, a group of housewives cannot invent a racket to reach the moon (don't get me wrong, I highly respect housewives for their contribution to families). It's the relevancy and variety of the inputs that matters.
I guess the author is a behaviourist who see thinking process as black box, i.e. non-observable and non-measurable. Thus, he only concentrates on the observable and measurable stimuli and responses.
I am a trainer for creativity for my company. I find this book very useful. The only complaint is that not all the games are up to my personal standard: able to demonstrate the theory AND able to energize the participants.
All in all, I highly recommand this book. You will see creativity in a different angle.