If you reward your children for doing their homework, they will usually respond by getting it done. But is this the most effective method of motivation? No, says psychologist Edward L. Deci, who challenges traditional thinking and shows that this method actually works against performance. The best way to motivate people--at school, at work, or at home--is to support their sense of autonomy. Explaining the reasons why a task is important and then allowing as much personal freedom as possible in carrying out the task will stimulate interest and commitment, and is a much more effective approach than the standard system of reward and punishment.