mox, when I taught western lessons, we would do the following with beginners/intermediates:
Guiding - lots of circles, changes of direction etc.
Leg aids - introduction to leg aids followed by exercises to improve
Transitions (lots of them)
Improving balance - lots of stirrupless work, hands above your head, out to the sides, etc.
Confidence building - usually through games
Rating the horse- maintaining a nice slow jog, etc.
Basically, at this point, I just "put miles" on the riders...and let them learn how to correct/troubleshoot without me having to tell them.
Not until the rider had mastered all of these skills did I start to refine them
Does that make sense?