This book was really good, it gave a great history section, overview of theory, and general explanation of what Ba Gua is about. There are very good explanations of internal power theory, the differences between the different levels of that theory(muscular effort to internal power, and what the differences are between each level). It also includes several two-man sets which are very good, and a section on applications. Strategy and actual applied fighting theory are elucidated to good depth, which made me quite happy. This book is a great overview, but don't buy it expecting to see tons of forms and the whole style laid out before you, there are a couple of chi-gung forms( with very good explanations), the aforementioned two man sets, and several applications. This book is a steal at 12 bucks and I would suggest it to anyone interested in Ba Gua- especially if you don't know anything about the style. This book presents the best introduction I have seen to Ba Gua, it's history and basic theory; one that clearly states what is esoteric and what is concrete, and is a very straightforward treatment of this style which is many times shrouded in obstrusity when discussed.