This is an instructional book with a limit on text and a premium on diagrams of scales. Aims to link the scale patterns together while providing a framework within which the guitarist can improvise - ie where you can fret to get the minor third in any key and know where you are in the scale. This book has made me a better player by showing me how to play the scales I need to use in jazz and it gets referred to frequently. By no means exhaustive, it covers the main scales well, starting on diffferent fingers on different strings. Suitable more for people who don't know the scales, it might provide new ways of playing scales unfamiliar to more experienced guitarists. Could have had more scales in it, but overall it is informative without being overly complicated.