This "book" is really a complete course in the advanced techniques of the legendary W. D. Gann. It provides a comprehensive coverage of the subject without excessive padding. I own this book as well as the original W.D. Gann master commodities course and I would like to say that it makes no sense buying the master course which is sold for several hundreds to over a thousand dollars at other vendors. You would be better off by purchasing this bookand receiving the same information! You will also receive the important overlays and other large charts which comes with the "original Gann course"!"