More and more, I see (or have pointed out to me) similar techniques across different kata. They are not all identical, but have the same intention or principles behind them. Some of the ones I have encountered recently are: Head/neck grab and crank: saifa, sepai, seisan, sanseru (seienchin as well, but not in the tradition I am training in) standing arm bar: seienchin, saifa, shisochin different standing arm bar (I've forgotten its name): kururunfa, sepai escape from rear bear hug: shisochin, seienchin, seisan guardian opens and closes the gate: saifa, seienchin, seisan, kururunfa, shisochin, hakkucho escape from front bear hug: kururunfa, happoren, shisochin leg takedown: sanseru, kururunfa, tensho (with interpretation) shoulder wheel throw (kata garuma): kururunfa, shisochin front strangle escape: seienchin, shisochin, happoren There are plenty of others, too. It raises the question: Why have so many kata, if there is so much overlap? But that's a questi...