CES made clear how much our whole notion of what a computer does is changing. Only a few short years ago, we used computers only at our desks. Now there are laptops, netbooks, the Mac Air, Ultrabooks and tablets of all sizes.
Even if you are the best coach in the world, if the person you are coaching shouldn't be coached, the coaching isn't going to work. The good news is that the "uncoachables" are easier than you think to spot.