Do ("empty hand way") were just Korean transliterations of "Karate-Do." Therefore, they founded a 'new' art, Tae Soo Do (later renamed Taekwon-Do) and created new forms, the Chang-Hon forms. Then Gen. Choi, Hon-Hi fell out of political favor, fled the country and took the ITF with him. Back in Korea they founded the Kukkiwon in 1972 and the WTF in 1973 to serve as the technical headquarters and center for the sport of Taekwondo, respectively. They created the Palgwe (which were judged to be too "Japanese" also) and then Taeguk forms. The rules for the sport were changed to favor foot techniques to differentiate it from Karate and also to try to bring back some of the concepts from Taekkyon, an older Korean Martial art from which Tae Kwon Do took its name. Depending on the style and organization the difference between the two arts can be minimal, with only differences being the forms, or it can be dramatic (ITF's Sine wave looks nothing like the way most Tang Soo Do stylists perform their forms). It really is a matter of personal preference, and more importantly, lineage. Some of the chambers have changed, and a few stances are done differently, but for the most part, the two arts are still recognizable as sister arts. I hope this clears some things up and was not confusing. I tried to write it quickly during my planning period. Feel free to ask questions in here or privately, or if I made any mistakes,