Unlike some other self-help books this one treats anger as a tool of self-development and an opportunity to learn more about yourself. It does not teach you to control your anger, quite the opposite, it says that one has a right to feel the emotions that one experiences without feeling guilty about it. It teaches that you cannot control the others or their feelings and opinions. This is the first very helpful lesson I learnt. Trying controlling others is what often makes you even angrier. According to the author, your anger is your own problem, and you simply cannot rely on others to sort it out for you. If you are unhappy with someone, it is your responsibilty to make a decision (ranging from "I can live with it" or "This is unacceptable - this will have to change"), think of acceptable changes and folow the through. She sees all relationship as "dances", where if you want to change your usual "steps" and break the circle, you will have to realise that it will inevitably affect your partner, which might result in him/her also changing their "steps". She does warn also that it may result in them stopping the "dance" altogether - i.e. stopping the relationship. This book will help you to gain insight into what YOU really want.
Another good advice is never make important decisions or argue your case when you are hurt or angry. At this moment you are very vulnerable and confused and probably will not be able to communicate your feelings to others.
Wonderful book - worked like magic with my partner! Everyone should read it - it is not just for women! Full of examples, which when you read, you go "OMG, this is SO about me!".
Please, please, please - read this book! It's very insightful and (mostly) positive!