Re: One student who doesn't understand
I have a student very similar to what you describe. He always asks how he should practice, at 25% or 50% and so on. I always tell him to go slowly and he almost always goes too fast. I find though that I just have to keep telling him to go slow and give him an additional demonstration of the technique, using his practice partner as uke. Once I do this I stress that I do not want him to go any faster than what I just did. It has been close to 6 months now and he is getting better.