Great post, Mark. Especially the part about "learning and applying principles - over remembering rules or a set of instructions. If I may, I would like to add emphasis to 2 of your points. First point of emphasis: #2 Sometimes it is difficult or even impossible to know when the rope is safely on the ground. And I would suggest that it applies equally to SRT and DRT. So, when you're not sure if it's on the ground, you should take added steps to ensure your team's safety. Your method may be different than mine, but the point being, you should do something. Contingency anchor, stopper knot(s), ascending gear ready....it may be a combination of things. Think of it this way. Would you knowingly rappel a drop that was short rigged? On purpose? Let's say, dangerously short rigged...as in 100', 200', 500'? I wouldn't, at least not without; 1 - there is a stopper knot, 2 - my ascending gear is at the ready. Maybe you're thinking, bah, he's goofy. (And maybe I am.) Even so (and especially if you are thinking that), I have a training suggestion for you. Go find a 200' drop and short rig it 100'. What are you going to insist on before saying, "on rappel!"? I'm not being hypothetical here, this is a serious suggestion. Get your stuff ready, rap down to the end of the rope and then come back up. I submit that if you do this, just once, you will approach all future unknown rappels differently. Second point of emphasis: #6 I'm always skeptical when someone says, "Yes, I know how to do a changeover" (rappel to ascend/ascend to rappel). If I don't know you and I'm going to be responsible/your trip leader, and when it's important that you know this (which is more often than not); I will probably ask you for a detailed explanation of the process. Yeah, I'm that kind of a guy (jerk). Please. Practice these things....regularly. I hope you never have to use them. But not near as much as I want you to be ready to use them, when you absolutely have to. Muscle memory doesn't only apply to organized sports.