In george herbert meads theory of socialization, when individuals see themselves as others see them, they have accomplished:

In george herbert meads theory of socialization, when individuals see themselves as others see them, they have accomplished good communication. Individuals are brought forth in this world to learn and understand things that are around them. It is innate in humans to socially interact and understand the "significant symbols" that people do to convey messages towards each other. If such good communication and understanding of symbols are understood, the person will have a better understanding of the self, and the people around that person will also have a better understanding of who this person really is.

Sector is best defined as (part).