Roughly half of this book is out of date, or obsolete, or simply inapplicable. The business of running a wargame company, as the business of publishing in general, changed completely with the advent of desktop publishing software for layout, and the internet for sales.
The case study by Richard Berg is surprisingly relevant still, as are the notes on game development. Many of the lessons here, such as the level of detail in counters and maps, are still being re-learned by every new game developer. In fact, it has occurred to me to mail a copy of this to the designers of a few recent board- or war-games, but let's face it, nobody reads anymore, and any comment of constructive criticism gets drowned in the circle-jerk deluge of sycophantic likes and gushing praise that is social media.