 More telling, perhaps, is the possibility of making a mistake, as when I intend to walk home by the shortest possible route, but have taken a wrong turn. Do I count as being embarked on walking home by the shortest route? If not, the theory stands refuted. If so, I can be on the way not only to doing something I will never do because I will be interrupted, but something it is now impossible for me to do. Can we explain how my doings are directed at that impossible outcome except by appeal to the intention with which they are performed?