Probably the worst "most influential book" I've ever read. It's inconsistent to the point of being nearly incoherent in places, and yet persevering to get to the second half of the book was worth it. Aside from the t-shirt slogans (and there are many) it has several frameworks for consideration that are worth pursuing, but in need of a great deal of development. Not sorry I read it, but it seems like a more modern synopsis of its core ideas would be a more worthwhile use of time.