Purchase the entire set and save! OPTP Essentials are must-have resource sets that serve as excellent reference material for experienced practitioners, or as groundwork for those just starting out in a chosen method. The Essential Diane Lee Set consists of the latest editions of her best-selling works: An Integrated Approach to the Assessment and Treatment of the Lumbopelvic-Hip Region DVD set co-produced with Linda-Joy Lee, The Pelvic Girdle, and The Thorax: An Integrated Approach.