The Great Grammar Book is an essential tool for students and writers. The book begins with a one-hundred question diagnostic test to allow the reader to assess their strengths and weaknesses. It is written in traditional text book style with brief explanations of the rules, followed by an exercise to put what is learned into practice. I thought the chapter on Successful Writing Strategies to be especially helpful. My only criticism is with the way it is advertised as entertaining. Some of the sentences given for editing were statements of trivial facts, but I did not read anything that added interest or entertainment value to the book.