Sectional interest groups promote the interests of a specific group in society, like trade unions negotiating for members' wages and working conditions
Social movements are loosely structured groups with a single objective, often politically radical, and facilitated by social media for quick organization
Insider groups have close contacts with ministers and civil servants, aligning with government views, while Outsider groups are not consulted by the government and have objectives far from the political mainstream
Insider groups lobby discreetly, negotiate behind the scenes, and may draft legislation, while Outsider groups use less discrete methods like social media campaigns, protests, and legal challenges
Think tanks are alternative sources of ideas to the Civil Service with more time and expertise than parties to carry out research and come up with policy solutions
Examples of think tanks influencing policy include the Universal Credit benefit system proposed by the Center for Social Justice and the shift in Conservative party policy in the 1970s influenced by right-wing think tanks