mention these famous examples because I believe that the quest for intelligent machines has also been burdened by an intuitive assumption that’s hampering our progress. When you ask yourself, What does an intelligent system do?, it is intuitively obvious to think in terms of behavior. We demonstrate human intelligence through our speech, writing, and actions, right? Yes, but only to a point. Intelligence is something that is happening in your head. Behavior is an optional ingredient. This is not intuitively obvious, but it’s not hard to understand either.