This book is the best I have read on pumping, having taken us(my son aged 10 and I) from very little knowledge on the subject, to convincing us it was for him, and to using it as an essential handbook and support tool now he is on the pump. Umlike some other books, it is so easy to read and understand, without having to read and re read it to get the meaning. The tables in it are so useful and much of the information is not easy to find altogether in one place in any other books. As in car repair books, this one is a 'dirty finger' book - you use it as you go along, and can never know more than the book or outgrow it. I have bought several copies for other people now, and everyone has been pleased with it.A must if you have a pump or are thinking about getting one.