Categorization refers to the individual's perception and judgment of the position of himself or others in society, which is not only based on the criteria of different classification of social systems in real society, but also based on the process of social comparison between himself and others. Classification is divided into social classification and self-classification. Social categorization is a subjective psychological process in which individuals divide others into different groups based on the similarity of sharing. Self-categorization means that the process of an individual from an independent individual to a member of a group is realized through classification, and the attribution of the group and the orientation of membership are realized through de-personalization.
Doctor Wang is often very proud of his profession is the self-classification according to the above definition.