There are many things to really like about this book. Music theory throughout the book is presented systematically from triads to seventh chords to altered chords and so forth. There are quizzes at the end of chapters to test yourself to make sure you really understand what was just presented in the chapter. There are ear training exercises in most chapters to develope your aural skills along the way. Graphics are professional and visually appealing. The diagrams really make the book easy to follow. Every critical chord group, scale, and mode is explained. The author gives advice on how the guitarist can apply scales over jazz changes and explains key centers and substitutions. Great book for beginning and intermediate level jazz guitarists.