I'd be interested in a few examples of what you describe in A, Mr. Weiss. Functionally, I believe most striking styles, particularly the Korean systems that fall under the 'tae kwon do' umbrella are remarkably alike, when contrasted to so-called internal systems such as baquazhang. Even the sine wave differences which have received so much attention in this thread is primarily cosmetic IMO, so I see no reason to differentiate so greatly between TKD styles. I suppose it's in the eye of the beholder. You might like ribeye and I might prefer tbone, but in the end both steaks are still beef. Sure. I even practice a version of the 'spring'. Some styles call it grounding or even rooting when striking or blocking. It's pretty widespread across striking systems. Where I differ is with the exaggerated up and down movement seen in so many ITF videos today. Some have explained that this exaggerated movement is actually a misunderstanding of General Choi's teachings, which is an entirely reasonable explanation. As you've doubtlessly guessed, I'm not a fan. And whether you want to call it spring style or sine wave, the fact is that the large up-down movement did not manifest itself until the eighties or so, give or take 5 years. This can be verified by comparing the pattern performance of TKD people according to when they or their instructor left the ITF. I don't doubt this is the case. Regardless, it doesn't address the fact that all these pioneers were card-carrying members of the ITF at one point and they were honored even as master instructors. It seems a bit self-serving at this point to say they're not teaching TKD, just because they're not with the ITF anymore, no? As I said above, tae kwon do is tae kwon do. You may certainly use a more narrow term like 'Taekwon-Do' if you like and reserve it for your own use. I have no interest in it. However, as a Jhoon Rhee system dan holder, I certainly did learn the Chang Hon patterns and I certainly did practice tae kwon do. If my hypothetical execution of the patterns suffer from a Chung Do Kwan taint, well then, perhaps the past leaders of ITF should be faulted for not making sure every single of their masters adhere to their standard. A moving standard at that.