Behaviorism learning theory is an explanation of learning, emphasizing observable behavior. It is believed that the pleasant or painful consequences of repeated behavior change the behavior of individuals, or individuals imitate the behavior of others. Behaviorism attaches importance to the role of environment and experience, and emphasizes various elements in learning and their interaction. Learning is to strengthen the connection between stimulus responses. Cognitive theory attaches importance to the psychological process that can't be observed when learning or memorizing new information and skills, and holds that learning is the change of cognitive structure. Constructivism believes that reality is nothing more than what people think. It is the process that learners construct their own reality, or at least explain their own knowledge construction according to their own experience.