Israel operates under a parliamentary system as a democratic republic with universal suffrage. A member of parliament supported by a parliamentary majority becomes the prime minister—usually this is the chair of the largest party. The prime minister is the head of government and head of the cabinet. Israel is governed by a 120-member parliament, known as the Knesset. Membership of the Knesset is based on proportional representation of political parties, with a 3.25% electoral threshold, which in practice has resulted in coalition governments.