This is without doubt one of the best books on game design ever written.
The author does a tremendous job on educating the reader about the intricacies of commercial game development. He is one of the games industry's "seasoned veterans" with over 35 commercial titles released, as well as two Game of the Year (GotY) awards to his name.
Anyone considering starting out to commercially design/produce a video game title (for any platform) must read this book. Then get every single member of their team to read this book.
I'd go so far as to say that I wouldn't want to work with anyone who hasn't read this book!
An absolute gem. Well done Bob!