First, let me say what this book is not. It is not a recipe book, or a book which describes the techniques for brewing beer. In other words, it is not for beginners.
After following recipes for a number of batches of beer, it was time to learn how to create my own recipes. The purpose of this book is to do just that; come up with your own recipes. The first part of the book tells the reader how to compute the grain bill, the hop bill and how to hit original gravity. It also contains information on beer color, yeast and water. I used this section to make the computations for my first original recipe. This, in turn, gave me the incentive to buy a brewing software package which I now use in conjunction with the second part of the book.
The second part describes beer styles and what ingredients go into each style described. There is a chart for each style which gives information on ingredients used in beers which made it to the second round of the NHC. I found some of the charts in this part somewhat confusing and there are a few references in the text to wrong charts. However, as a result of this book, I have started to formulate my own recipes with a lot of success.