One of the goals of teaching is to help students understand and retain what they learned in class. Retention rate here refers to the amount of information retained from a lesson. The lower the rate, the less the person remembers about the lesson, thus the higher the rate, the greater chance the student has in retaining or recalling the information. As explained in Part I, one way to increase retention rates is by activating more regions of the brain. One of the easiest ways to do this, is to teach the lesson to someone else, thereby elaborating on what they had just learned.