Anomic pressure groups are those that arise spontaneously in response to a specific issue or event. They are often short-lived and lack a formal organization.

Institutional pressure groups are those that are established on a permanent basis and have a formal organization. They typically represent a specific interest group, such as workers, businesses, or religious groups.

Sectional pressure groups are those that represent a specific section of society, such as a particular industry, profession, or region.

Cause pressure groups are those that are formed to promote a particular cause or issue, such as environmental protection, animal rights, or human rights.

Insider pressure groups are those that have direct access to the government and are able to influence policy-making. Political parties are the most obvious example of insider pressure groups.

Outsider pressure groups are those that do not have direct access to the government and must rely on other means, such as public protest, to influence policy-making. Social movements are the most common example of outsider pressure groups.

Peak associations are those that represent a broad range of interests within a particular sector of society. Business associations are the most common example of peak associations.

Interest groups are those that represent the interests of a specific group of people. Trade unions are the most common example of interest groups.

Lobby groups are those that attempt to influence government policy in order to benefit their members. Business associations are the most common example of lobby groups.

Clientele groups are those that receive benefits from the government in exchange for their support. Religious groups are the most common example of clientele groups.

Coalitions are alliances of different groups that come together to achieve a common goal. Political parties are the most common example of coalitions.

Movements are large-scale, loosely organized groups of people who come together to promote a common cause. Social movements are the most common example of movements.

Networks are groups of people who are connected to each other through shared interests or goals. Business associations are the most common example of networks.

Think tanks are research organizations that provide analysis and advice on public policy issues. Business associations are the most common example of think tanks.

Public interest groups are those that work to promote the public good. Social movements are the most common example of public interest groups.