This is a very helpful book in identifying the various types of manipulation that exist - indeed much of the book is devoted to the various types that exist in all people. But, it's a bit thin on really getting to the bottom of the problem, a problem that the book itself highlights....which is to strengthen your own self. For that, and for a better understanding and complete strategy read, "When I say No, I feel Guilty" by Manuel J Smith. I think that the When I say no book is much more positive, and gives a very extensive 10 Bill of Rights to live by, keeping your focus on yourself, instead of your manipulator. The two books could work well together. In Sheeps Clothing as a good first step, and then WISN,IFG as the second and rest of your life final step.