"TAPP" a new acronym for Skier Analysis (Technique, Alignment, Psychology, Physiology)
Instructors and coaches can use this tool to better assess their clients/athletes to more efficiently and accurately reach a skier's potential. Once we come to the realization that working on technique alone or thinking that everything can be improved by working on drills and exercises is a bit naive, we can use TAPP to take a better inventory of areas of weakness and move to address these four areas which will ultimately improve and optimize skiing performance most efficiently.
Imagine a diamond with one of these four parameters on each corner (sorry Weems, I stole a diamond). Once we understand each parameter and how it can affect our skiing we can move freely from one to the other assessing skiing performance and working on the area(s) needing attention to permit progress. In other words, if we watch a skier like this http://www.youtube.com/watch?v=MQwHrcHIhv4 we can assess each corner of the TAPP diamond and find four different possibilities for his issues. While most instructors go right to technique and work solely in this corner, they would see greater results if they first fixed the equipment issue by suggesting a better boot and proper alignment. This would change his skiing immediately by removing some impediments cause by his current set up. Then perhaps addressing his psychological INTENT, which clearly is to use turning to brake or slow his descent. Notice he is skiing the fast line slow rather than a slow line fast and his skis are scraping sideways to slow down rather than moving forward with the tip and tail passing more through the same spot on the snow. Changing his intent would also dramatically affect his technique without doing a single exercise or discussing turn mechanics. I doubt the fourth corner of Physiology is a major contributing factor for this particular skier as he is young and fit and has a hockey background but it should be visited.
So you can see that evaluating the four corners of the TAPP diamond will give the instructor/coach a better picture of areas which need addressed to clear the way for improvement!