Classical conditioning involves learning a response to a stimulus. Teachers can use classical conditioning techniques to shape student behavior. For example, a teacher could condition students to quiet down by consistently knocking on a table before instructing students to be quiet. Eventually, the students will learn to associate the knocking with quieting down. Operant conditioning uses reinforcement and punishment to change behavior. A teacher could positively reinforce a shy student for participating in group activities to help the student perform tasks alone in front of the class. Social learning theory emphasizes observational learning and modeling. For example, a student may start excelling in class from modeling another student's behavior and seeking approval from the teacher.