The main point of Waishuo's theory is that human development mainly depends on external forces, such as the stimulation and requirements of the environment, the influence of others and school education. For example, Xunzi's theory of evil nature, Locke's? It says on the whiteboard? .

Another typical representative of the theory of externalism is American behavioral psychologist Watson. Watson even said that by giving him more than a dozen healthy babies, he could train them into all kinds of people, from leaders to thieves, regardless of the situation of their ancestors.

Because foreign scholars emphasize the role of external forces, they generally pay attention to the value of education and hold a positive and optimistic attitude towards education to transform human nature and form the knowledge, ability and attitude needed by society. They pay attention to human learning: what to learn and how to learn effectively.