@Texas6 Its a sport psychology technique. For each pass, you should focus on 3 things to do to ski a successful pass. For Matt, his 3 keys tend to be patience, soft knees, hips to the next ball.
Everyone's "3 keys" will be different, just depending on what you're working on. It is important that the "3 keys" are always actions to take, not actions to avoid. For example, one of your keys may be "wide gate". That is very different than "don't start narrow". For whatever reason, if you tell yourself to "don't" do something, your brain/body tend to ignore the "don't" part and you end up doing exactly what you were trying to avoid. Never think in the negative.
I say my 3 keys to myself over and over as I'm sitting at the end of the lake, getting pulled out of the water, pulling out for my gate, rolling in for the gate, etc.
I'd say that this mental training technique improved my skiing more than anything else I've done in years. I'd say its also working for @MattP