I had no idea that ranking could vary so much from dojo to dojo with in a single style. In my dojo we have neither red nor blue nor stripes of any kind. Heian Nidan is the kata we need to learn to proceed from yellow to orange. H.Shodan = White to yellow H. Nidan =yellow to orange H. Sandan = orange to green H. Yondan = green to purple (5th kyu) H.Godan =purple to purple (4th kyu) Tekki Shodan= purple to brown(3rd kyu) Basai Dai=brown to brown (2nd kyu) After that it gets to be a bit more of choice. To advance to 1st kyu you can either choose one of the slightly more advanced kata (jion, empi or kanku-dai) or stick with Basai Dai and try to better it. Most people stick with Basai Dai because it can be viewed as being arrogant to choose one of the other three. For Shodan you must know all of the listed kata. You choose one as 'yours'. During your test the Masters will choose a 2nd one for you to do. It is usually one that compliments the one you chose as yours. If you choose a fast kata, they will choose a powerful one, sort of thing. I will soon be taking my 2nd kyu test and am focusing on Basai Dai, though I have learned the basics of both Kanku Dai and Jion, by which I mean I can get from start to finish reliably-but it's not pretty. I have pieces of Empi down, but I don't have them connected yet. At this point my favorite is Tekki Shodan, I have placed in tournaments with Basai Dai as a team kata and I think that Kanku Dai is on it's way to being my next favorite kata.