how far are pressure groups successful in their aim

Pressure groups are collections of individuals who hold a similar set of values and beliefs based on ethnicity, religion, political philosophy, or a common goal. Based on these beliefs, they take action to promote change and further their goals. For example, members of Mothers Against Drunk Driving (MADD) share a common belief that, in turn, influences the actions (e.g., advocacy, public awareness programs, policy research) they use to achieve their goals.