The document discusses different theories of interest group politics, including pluralism, elitism, and hyperpluralism. Pluralism suggests that many competing groups balance each other out, while elitism argues that powerful corporate elites dominate the policy process. Hyperpluralism posits that interest groups have become too powerful and weakened government. The document also examines what makes interest groups successful, such as their size, intensity, resources, and use of lobbying, electioneering, litigation, and going public.