Oriented towards the jazz and commercial tenor or bass trombone player, this book is a set of 47 one-page "units," each with a few short exercises on each concept. Unlike many technique books, this book does not just present a series of large etudes with many technical problems. Instead, each unit focuses on a specific trombonistic technical issue (lip-break articulations, glissando, chord progressions, etc). It also contains a nice section on "doodle" tonguing. The included demo CD contains recorded examples by Watrous (tenor) and Raph (bass) of most of the exercises.