| A | B |
|---|
| aggregate | when people gather in the same place at the same time but lack organization or lasting patterns of interaction |
| social category | a menas of classifying people according to a shared trait or a common status |
| dyad | group with two members |
| triad | group with three members |
| small group | group with few enough members that everyone is able to interact on a face-to-face basis |
| formal group | structure, goals, and activities of this group are clearly defined |
| informal group | this group has no official structure or established rules of conduct |
| primary group | small group of people who interact over a relatively long period of time on a direct and personal basis |
| secondary group | group in which interaction is impersonal and temporary in nature |
| reference group | any group with whom individuals identify and whose attitudes and values they adopt |
| in-group | group that a person belongs to and identifies with |
| out-group | any group that the person does not belong to or identify with |
| e-community | group of people who interact with one another regularly on the internet |
| social network | web of relationships that is formed by the sum total of a person's interactions with other people |
| direct relationships | relationships with those whom we interact within our primary and secondary group relationships |
| indirect relationships | relationships with people we know or who know us with whom we have little or no interaction, such as friends of a friend |
| leaders | people who influence the attitudes and opions of others |
| instrumental leaders | task-oriented leaders who find specific means that will help the group reach its goals |
| expressive leaders | emotion-oriented leaders who find ways to keep the group together and to maintain morale |
