I often find Amazon reader reviews to be valuable. Here is what one reviewer of the book on Amazon had to say. (This doesn't necessarily say that the book is totally great.):

"Empathy is the key: once somebody feels that you understand them, and that you are trying to feel what they feel, then they will be more more likely to speak honestly with you to resolve conflict. Empathy trumps psychology every time. However, it also requires you to suspend all judgment that the other person is a monster -- merely another human being trying to fulfill their needs in the only way they know how.

"The rules behind nonviolent communication are simple, and believable, but the application is extremely difficult. Our brains are wired for survival, not dialog. If I were speaking to a psychopath, the last thing on my mind would be his needs! However, Marshall gives several examples on how empathy is the most effective weapon when you want to defuse a dangerous situation.

"Its instinctive to make snap judgments when we feel threatened. It takes a lot of courage and practice to do what Marshall does..."