It is a good example of a clear set of instructions to editors. Editors should be dedicated to making the book technically competent in addition to technically accurate. A technically competent book is one that does not cause the reader to stumble or to seek other references for the information that is supposed to be in the book. Ensure that every text and non-text element is correct. In short, put yourself in the shoes of the intended reader and scrutinize every detail.
Consistent terminology is an important element of a well-written book.
Keep the book's editorial style sheet handy and updated to ensure that consistency throughout the entire book. Scrutinize each non-text element as you would the text. The book's style sheet also applies to non-text items, so use and update the style sheet as you would for text. Make sure the files are properly named. Keep a tally sheet for each chapter, showing the name of each screen shot, whether it is full, partial, or labeled, and its status.