I read and then studied this book over 20 years ago. Since then I have looked at similar works that are more complex sometimes using more oblique terms and concepts. This remains in my humble opinion the most useful and practical work on improving a person's ability to effectively communicate and cope with others at all ages in life.
As a means of lessening anxiety in social situations this work if practiced and made part of your way of behaving will greatly improve your ability to get along with people.
Even if your a confident, mostly non anxious person, an indepth study of this work with a lot of practice will bring an even greater sense of being able to cope with most social situations.
It covers all aspects of conflict resolution in peer groups, be it with family, friends, fellow workers, between kids, between you and your kids.
It shows you how to do what you want, if not all the time, then at least some of the time no matter who are dealing with or what the situation may be.
It is not about control as you can't control anyone without bullying. It is about confidently using your human ability to cope and adapt and ultimately to verbally communicate with other people in an effective way that leaves you feeling and knowing you were not manipulated emotionally or bullied.
Remember this is about social, mostly civilized situations, not for when dealing with nutters or muggers.