This book is simply the best book on catering, food service, the restaurant business, industrial cooking, and the entire back-end of the food-service industry.
I believe it to be a textbook, as it is written like one. No matter - there is almost limitless valuable [and invaluable] data stored in this almost-pocket-sized book.
No manager or pro chef should be without this book - even if you don't read it, you would still have a resource for those emergencies that arise.
Costing, food prep, equipment - it is all in there. I have not seen a more complete or better book on the vast array of segments of the food-service trade.
Buy it!
Btw, you can only bring one copy into the US per account or name, so plan ahead of you want more copies!