| Term | Definition |
| K Street | location of the offices of nearly seven thousand organizations that are represented in Washington |
| Interest group | An organization of people sharing a common interest or goal that seeks to influence. |
| Institutional interests | individuals or organizations representing other organizations. |
| Membership interests | organizations supported by by the activities and contributions of individual citizens. |
| Incentive | Something of value one cannot get without joining an organization. |
| Solidarity incentives | The social rewards (sense of pleasure, status, or companionship) that lead people to join political organizations. |
| Material incentives | Money or things valued in monetary terms. |
| Purposive incentive | A benefit that comes from serving a cause or principle. |
| Ideological interest | Political organizations that attract members by appealing to their political convictions or principles. |
| Public interest lobby | A political organizations that attract members by appealing to their political convictions or principles. |
| Think tanks | think tanks are public interest organizations that do research on policy questions and disseminate their findings in books articles conferences etc |
| Social movement | A widely shared demand for change in some aspect of the social or political order. |
| Political cue | A signal telling a legislator what values are at stake in a vote, and how that issue fits into his or her own political views on party agenda. |
| Ratings | Assessments of a representative's coting record on issues important to an interest group. |
| Insider strategy | strategy of lobbyists that work closely with a few key members of Congress, meeting them privately to exchange information and favors |
| Outsider strategy | Aimed at changing public opinion strategy involves media advertising designed to educate the public or letter wrting phone and fax campaigns designed to impress public officals |
| Federal Regulation Lobbying Act | Requires groups and individuals seeking to influence legislation to register with the secretary of the Senate and the clerk of the house and to file quarterly financial reports |