When practice does NOT make perfect
Learning a good golf swing is mainly a matter of motor skill acquisition. We need to learn a series of precisely timed movements, with little tolerance for error, and be able to repeat these movements exactly, each time.
I think one of the most neglected parts of golf instuction is teaching the student what to do after he/she leaves the lesson tee. The goal of the teacher is to help the student change and improve. To this end the student gets feedback, advice, exercises and drills. The student leaves the lesson tee with the assumption that he/she will practice on their own and (hopefully) return, showing improvement and the cycle starts again.
Here's a true scenario I observed at the driving range a few years back: Two golfers in the next stalls over were discussing a local teaching pro. "I must have taken 20 lessons from X," says the first guy, "but I stopped." "Why?" asks the other. "For the last 10 lessons he kept telling me the same thing." said the first.
Who was at fault? The student or the pro or both?
How do you get students to change their habits? I know I've had the experience of starting off consciously doing a drill or trying to make a swing change, and then after 15 or 20 shots my concentration wanders and pretty soon I've fallen back into the old pattern. How much practice is enough?
Does anybody use visualization drills? Do they work?
In piano pedagogy, you start off practicing a difficult passage very slowly and gradually build up speed. Do you think slow motion practice translates the same way into a full-speed golf swing?
Sorry for so many questions, but I really believe this is a key issue.