How Parliamentary Systems Work

In a parliamentary system, voters elect a legislature, and the government is formed from it. The prime minister is usually the leader of the largest party or coalition, and ministers are normally members of parliament. Crucially, the government depends on the confidence of the legislature: if it loses a confidence vote, it must resign or call an election. This 'fusion' of executive and legislature means a government with a stable majority can usually pass its programme quickly.

Accountability runs through parliament, via debates, committees and question time. The head of state, a monarch or ceremonial president, is separate from the head of government. Britain's system evolved gradually, with Robert Walpole often called the first prime minister. Strengths include flexibility, since leaders can be replaced without an election; critics point to strong executive dominance when one party holds a large majority.