To be simple, after Bruce Lee died, his students divided into 2 groups JKD concept ---- Dan Inosanto, the guy continues to do research and learning other martial art, considering that JKD is only concept of "using what is useful for yourself and abandoned the useless" as what Bruce Lee mentioned. Gaining his blackbelt in BJJ at his 60's and still learning other martial art. And added many Southeast asia martial art in training context. Original JKD ---- Ted Wong and other students would like to fix what is "JKD", teaching only what Bruce Lee "teach" and "learn"....Whenever there is problem, just looking into what Bruce Lee learnt, Wing Chun, Fencing and etc. No information is allowed to add. Under Original JKD, this also divided into 2 more new group..... 1) Original JKD kick boxing teaches only striking fight 2) Original JKD grappling teaches only about 30 grappling skill that shows in late Bruce Lee's private information.