Spinedoc
Brown Belt
This is something I'm experimenting with right now in NGA. I've taught a few counters to white belts, and will continue to increase the number. I'm looking to find the point at which they seem to be actually ready for them. I didn't start picking them up in any quantity until probably ikkyu (brown belt, just before black), and I think they can start earlier. One thing I'm doing is using simple counters (things like putting a foot in a position that makes the technique a bad choice) to make them change techniques mid-stream. Of course, to practice this, they have to practice that simple counter. So, even though I'm not teaching a counter, I'm teaching a counter. Next comes full counter-techniques.
Well, speaking for our dojo, we practice kaeshi and henka waza on occasion, and the junior students are expected to practice it as well (we only have one practice, it's not divided into advanced or regular or anything like that)...so even 6th kyu might be shown them. The problem is retention. Our Sensei expects them to practice, but doesn't really expect to call a student below 2nd kyu up to demonstrate them. The brain can only focus on so many things, and I know that he has said that junior students can be shown them, but usually won't retain them, because they are still focusing on the basic technique itself. At higher levels, however, he expects you to be able to make them work, and to remember them.