| Term | Definition |
| social capital | the myriad relationships that individuals enjoy that facilitate the resolution of community problems through collective action |
| civic virtue | the tendency to form small-scale associations for the public good |
| disturbance theory | interest groups form in part to counteract the efforts of other groups |
| interest group | an organized group that tries to influence public policy |
| economic interest group | a group with primary purpose of promoting the financial interests of its members |
| public interest group | an organization that seeks a collective good that will not selectively and materially benefit the members of the group |
| lobbyist | interest group representative who seeks to influence legislation that will benefit his or her organization through political persuasion |
| trade associations | groups that represent specific industries |
| lobbying | the activities of a group or organization that seeks to influence legislation and presuade political leaders to support the group's position |
| collective good | something of value that cannot be withheld from a non-group member, for example, a tax write-off or a better enviornment |
| free rider problem | potential members fail to join a group because they can get the benefit, or collective good, sought by the group without contributing effort |