Turn Right,
Our goal is to teach what each trainee needs to know so that they can train out on the floor and hopefully certify. Like Scott says when we encounter a trainee that has problems we try to identify the problem then send them back to the training department to receive more classroom training, or run more simulations.
The purpose of the controllers who help run the problems is not to teach technique, but guide the trainee by showing them different ways to handle particular situations that they are struggling with, then let the trainee develop their own technique.
Mike