The Israeli system of government is based on parliamentary democracy. The Prime Minister of Israel is the head of government and leader of a multi-party system. Executive power is exercised by the government (also known as the cabinet). Legislative power is vested in the Knesset. The Judiciary is independent of the executive and the legislature. The political system of the State of Israel and its main principles are set out in 11 Basic Laws. Israel does not have a written constitution.