Without these fundamental consistencies, we would have great difficulty predicting behavior. For example, when you get into your car, you make some definite and, usually, highly accurate predictions about how other people will behave. In North America, you would predict that other drivers will stop at stop signs and redlights, drive on the right side of the road, and pass on your left. Can you imagine what would happen if driving behaviors were unpredictable？
Obviously, the rules of driving make predictions about driving behavior fairlyeasy. What may be less obvious are the rules （written and unwritten） that exist in almoste very setting. For instance, do you turn around and face the doors when you get into an elevator？ Mmost everyone does. But did you ever read that you're supposed to do this？Probably not！ We would argue that it's possible to predict behavior （undoubtedly, not al ways with 100 percent accuracy） in supermarkets, classrooms, doctors' offices, elevators, and in most structured situations. Just as we make predictions about au to mobile drivers （for which there are definite rules）, we can make predictions about the behavior of people in elevators （for which there are few written rules）.