First of all, I need to forwarn you, this book is NOT for beginers to astrology, it assumes you're already familiar with the basics.I found this book very helpful in my studies; it was a turning point in my use of this ancient science. Where basic natal astrology is useful for providing a basic pyschological profile for the client, the techniques described in this book point out how the progressions point to the evolution of the individual. It also goes into eclipses and how they describe events in the life.I would consider this book mandatory reading for anyone beyond the basics. 5+ stars for this one!