(3) Pressure groups play an essentialrole in democracy. Politicalparties cannot provideadequate representation forthe full range of diverse interestsand opinions in a moderndemocracy because their keyfunction is to aggregate interestsinto a coherent politicalentity capable of governing thecountry. Pressure groups enableparticular interests andcauses to be heard and to exertinfluence in public decisionand decision-making.