(i) Political parties reduce a vast multitude of opinions into a few basic positions which it supports. The government is expected to base its policies on the line taken by the ruling party. (ii) Those parties, that lose the elections, play role of the opposition. They voice different views and criticise government for its failures or wrong policies.Opposition parties also mobilise opposition to the government. (iii) Political parties shape public opinion by raising and highlighting issues. The political parties put before various problems of the country and try to explain them in an easy way through magazines, booklets and meetings.