Great if you have the time, energy and determination to spend 2 weeks writing down your child's tantrum times, reasons, surroundings, weather conditions and pulse rate. OK, yes I'm exagerating, but this book will make you feel a failure, because you can't do all that they suggest. And if you don't do all that they suggest then you are led to believe that finding a solution to your childs problem will never be found.
If you are struggling - don't get this book - find a self help group with other parents. You will learn more and you will build up a help network. Stay positive