I finished reading about 75% of this book, and I really like it. It is a rather small book, but that could be one of its pros, as it is easy to read and to the point. Although I'm not an expert on the subject or Psychology yet, from past readings & experience, my educated guess is that this book is also scientific and systematic. It makes sense to me and convinces me. The book is not going to be enough on its own to change you from an aggressive or submissive communicator into an assertive and attractive one, but it will help immensely if you read it at least 3 times while taking notes and also practice a lot of what you read. I would definitely recommend it to anyone who wants to change the way they communicate with others, whether you are aggressive & loud, or passive, submissive, and too soft, and would like to hit the elusive moderateness of assertiveness, which respects others enough while also respecting oneself and one's own wishes & needs.