I know that it is a kata of chinese origan, what system I dont know of sure but I beleave it came from one of the fukiun crain systems. I am not a goju student or practioner myself, but it is my understanding that it is one of the earler kata tought as at least one of the foundation kata for the style. ( again, I am not a goju man so cant say for certian but that is what I was once told by some one who had some goju training.)
Thank you Chinto for your input.