The Feedback Loop

The key to good design is as soon as you do something, you get feedback back to the user that something happened and what to do about it. This is actually a principle in software design as well. If you're trying to coach someone, you want to provide coaching in a similar manner where you tell them right away what they did wrong and then you give them an opportunity to fix that on the spot. The best example of this I've seen was Tito Ortiz who refused to let his boy leave until he learned how to counter a triangle attempt.