The significance of the clear mental picture is perhaps most apparent in the approach shot. Where the exact length of the shot can be measured, and where the character of the shot is determined by the hazards and other features of the course, every golfer who has obtained some command over his clubs addresses his ball with confidence. His environment forces the correct mental picture upon him. He cannot escape from it. There is no doubt, no vagueness as to what is required. But in the opposed type of shot, as, for example, an open approach to an unprotected green, with nothing to indicate clearly the length of shot which is called for, the golfer has himself to make up his mind as to the type of shot to be played. Probably half a dozen shots are open to him, and he has to select one of them. He may find difficulty in deciding which is the best, and he may change his mind whilst executing the shot. A large percentage of foozled approaches are due to this cause, as every golfer knows only too well. It is obviously of first importance that the player should never proceed to execute any shot, no matter how short or how easy it may appear, until he has definitely outlined in his mind the type of shot he intends to produce.