Stereotypes are formed mainly because we have no time and energy to communicate with every member of a certain group in the process of interpersonal communication, but only with some of them. So we can only infer the whole from the part, and infer the whole from the part we touch.

Stereotypes, once formed, are hard to change. Therefore, in daily life, we must consider the influence of stereotypes. For example, market research companies should generally choose women instead of men when recruiting interviewers for household surveys, because in people's impression, women are generally kind, less aggressive and more weak, so household surveys pose less threat to their owners; Men, especially able-bodied men, are easily rejected if they ask for home visits, because they are more likely to remind people of a series of things related to violence and attacks, which will enhance people's defensive psychology.

"Birds of a feather flock together, and people are divided into groups." People who live in the same area, engage in the same occupation and belong to the same race always have some common characteristics. Therefore, stereotypes are generally reasonable.

However, "people's hearts are different and each has its own face." In the final analysis, stereotype is only a general and general view, and it cannot replace a living individual. Therefore, the mistake of "generalizing the whole" is always inevitable. If we don't understand this, Zheng people, just like "cutting their feet to fit their shoes", would rather believe the stereotype of "size" than their own personal experience, which will lead to mistakes and the failure of interpersonal communication, and naturally it will not help us to succeed.