We establish goals, things we want them to accomplish during the week. There are normally three or four different things people do that hurt their games the most. If you take care of the big stuff, it's better than dividing their attention among a whole lot of things. It's more of a priority-list form of teaching rather than trying to do the whole thing in three days. You mentioned three or four things people do to hurt their games.
People make their biggest mistakes in the sequence in which things happen.
Most people who have an unorthodox swing start off in an unorthodox set-up position. The second mistake they make is in the start of the backswing. If they have a funny downswing, it's to recover from a poor backswing. Most people's instincts to hit the ball correctly are pretty good. But if they start the club back in the wrong position, then they must make an adjustment in order to recover from that.