I got an earlier edition of this book in Physical Therapy school and it was invaluable in teaching the finer points of goniometry. I constantly used it as a source of information, until I became comfortable with measuring joint range of motion. Since I am now working in the inpatient arena, I mostly repeatedly measure knees, but refer back to it when I need to brush up on another joint. It has clear pictures and overall is a great reference book for anyone who has to evaluate joint ranges of motion.