Jeet Kune Do was conceived by Bruce Lee as being his personal form of fighting system, based on his researches and discoveries. It may be taught, but cannot be standardized, because each individual has needs which are strictly his own.
Although it also contains techniques of its own, Jeet Kune Do remains a concept. To understand the principles, concepts and strategies of Jeet Kune Do, it is therefore imperative to know and study first and foremost the Jun Fan Gung Fu sytem. In clear, you can't mix combat styles and say, "I do JKD," if you did not learn Jun Fan Gung Fu before. You must study Jun Fan Gung Fu first and go to the pre-phases of JKD.
If we can say, to quote Bruce Lee, that: "Jeet Kune Do integrates everything, but is not integrated in anything", it must be said that certain styles or systems do not fit at all into the structure of Jeet Kune Do, because of their lack of fluidity for example.
Jun Fan Gung Fu, which uses the concepts of Jeet Kune Do, is constantly evolving and Dan Inosanto's contribution is immense. Based on his research (during Bruce's lifetime), Dan included, among other things, Panantukan and Sikaran, a Philippine foot-to-hand combat method (that can easily be replaced by Muay Thai). Those elements further increases the efficiency of the Jun Fan system, not only by their techniques, but also by their very sophisticated training method. The Filipino martial arts systems taught by Inosanto, such as the Lacoste system for example, are so similar in concept and practice that they help the understanding and effectiveness of Jeet Kune Do. Later, the principles and techniques of many other fighting styles such as Savate, Muay Thai, Penjak Silat, Jiu-Jitsu, and Shoot Wrestling were included in the Jun Fan Jeet Kune Do curriculum.
SDA or SAA: Single Direct or Angular Attack
ABC: Attack By Combination
PIA: Progressive Indirect Attack
ABD: Attack By Drawing
HIA or FIA: Hand or Foot Immobilization Attack
*You can consult the book ‘Jeet Kune Do’ by Sifu Salem Assli to better understand this chapter.