Originally, Lee had studied and researched various forms of martial arts and would formalize a system named Jun Fan Gung Fu circa 1962. However, around 1964, following his encounter with Wong Jack Man, Lee came to realize the error of binding oneself to a systematized martial art and denounced the Jun Fan Gung Fu. Following this, Lee began to passionately work on research and practice in order to refine his way of practicing martial arts. In 1965, he outlined the basic concept of Jeet Kune Do.