Although Mr Crosby is no longer with us, his ideas have been around since the space program started making rockets that didn't blow up.
In short:- make it right - don't make it wrong. It sounds simple, but you need to define what is right in the first place. You need to figure out how to make it right, and what do we do about the stuff that is only a "little bit wrong"? This book simply tells you about what you already knew but never think about. It also tells you how to get the whole company to work this way AND SAVE CASH!!!
The down side is that it talks about how his own company consults, which, given the age of the book is less relevant.
Its not a fad "instant fix" book, and not just about Manufacturing either. The concepts here apply to a post office, a call center, a dress shop, or even your own life. Not enough people own this book.