Sociologist Charles Horton Cooley (1864–1929) suggested that groups can broadly be divided into two categories: primary groups and secondary groups . According to Cooley, primary groups play the most critical role in our lives. The primary group is usually fairly small and is made up of individuals who generally engage face-to-face in long-term emotional ways. This group serves emotional needs: expressive functions rather than pragmatic ones. The primary group is usually made up of significant others, those individuals who have the most impact on our socialization. The best example of a primary group is the family.
Secondary groups are often larger and impersonal. They may also be task-focused and time-limited. These groups serve an instrumental function rather than an expressive one, meaning that their role is more goal- or task-oriented than emotional. A classroom or office can be an example of a secondary group.
Neither primary nor secondary groups are bound by strict definitions or set limits. In fact, people can move from one group to another. A group of coworkers, for example, can start as a secondary group, but as the employees work together over the years, they may find common interests and strong ties that transform them into a primary group. As we will discuss in the chapter on Media and Technology, even online networks of people with common interests can sometimes move from secondary to primary group status.