Jeet Kune Do is NOT a system. A system is a formula or an established procedure used to attain an end. The Do in JKD means Art. An art is open to interpretation and expression. In Bruce's own words in a letter to Hawkins Cheung "No, I did not mean to create another style. JKD started out as my expression of Lop Sao." JKD, being an ART, lies over the realms of system AND concept.

It lies in the realm of system because as was found, a person's techniques should be governed by Conservation of Movement, Non Telegraphic movements, and overall effectiveness, among others. It lies in the realm of concept, because each of those points applies differently to different people. Reason being because the way a person might do a non telegraphic movement might differ because of his body structure or attributes.

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