This book contains great information on the history of Kali (arnis, escrima, etc) as well as the basic concepts and drills that are taught by Dan Inosanto. None would argue that Danny Inosanto is one of the leading authorities on Filipino martial arts and his book demonstrates his depth of knowledge. It is complete with pictures and diagrams, making a lot of the information relatively easy to learn. Learning any type of movement from a book is difficult, but this book does a pretty good job of making the information clear. It's a collectors item as well as a great martial arts reference.