The size (amount or magnitude) of a reinforce is an important determinant of its effectiveness. Consider the following example. Staff at a large mental hospital discovered that only 60% of the female patients brushed their teeth. When the patients were given a token that could be cashed in later for reinforcering items (Cigarettes, coffee,or snacks) for brushing their teeth, those who did so increased to 70%. When the patients were given five tokens for brushing their teeth, the percent who did so increased to 91%. Now consider an example that is more typical of many of our everyday lives.