Although Bruce Lee officially closed his martial arts schools two years before his death, he allowed his curriculum to be taught privately. Since his death, Jeet Kune Do is argued to have split into different groups. Allegedly they are:
The JKD Concepts branch whose proponents include Dan Inosanto, Richard Bustillo, Larry Hartsell; these groups strive to continue the philosophy of individual self-expression through re-interpretation of combat systems through the lens of Jeet Kune Do, under the concept that it was never meant to be a static art but rather an ongoing evolution, and have incorporated elements from many other martial arts into the main fold of its teachings (most notably, grappling and Kali / Escrima material) based on the individual's personal preferences and physical attributes. The entire JKD "system" can be described through a simple diagram, and the concepts can then be applied to a variety of contexts in a "universal" way.
JKD framework This type of JKD provides the guiding principles. Bruce Lee experimented with many styles and techniques to reach these conclusions. To Lee these principles were truisms. The JKD framework is not bound or confined by any styles or systems. This type of JKD is a process.
JKD Personal Systems This type of JKD utilizes the JKD framework along with any techniques from any other style or system to construct a "personal system". This approach utilizes a "building blocks" manner in which to construct a personalized system that is especially tailored to an individual. Lee believed that only an individual could determine for themselves what the usefulness of any technique should be. This type of JKD is thus a product.
Original (or Jun Fan) JKD branch believes that the original principles before Bruce Lee died are all that is needed for the construction of personalized systems. The
JKD Concepts branch believe that there are further principles that can be added to construct personalized systems. The value of each Branch can be determined by individual practitioners based on whatever merits they deem important.
OJKD follows all Bruce's training from early Jun Fan Gung Fu (Seattle period) and focuses on trapping with Wing Chun influence.
Jun Fan Jeet Kune Do is a signature version of JKD as Bruce taught privately to Ted Wong. This is a later time period and practices a greater emphasis on elusiveness and simplified trapping unique to Bruce's later approach to combat. The focus is with Fencing and Western Boxing.