governments are generally required to have the confidence of the lower house of parliament (though a small minority of parliaments, by giving a right to block supply to upper houses, in effect make the cabinet responsible to both houses, though in reality upper houses, even when they have the power, rarely exercise it). Where they lose a vote of confidence, have a motion of no confidence passed against them, or where they lose supply, most constitutional systems require either: The latter in effect allows the government to appeal the opposition of parliament to the electorate. However, in many jurisdictions a head of state may refuse a parliamentary dissolution, requiring the resignation of the prime minister and his or her government. In most modern parliamentary systems, the prime minister is the person who decides when to request a parliamentary dissolution. Older constitutions often vest this power in the cabinet. In the United Kingdom, for example, the tradition whereby it is the prime minister who requests a dissolution of parliament dates back to 1918. Prior to then, it was the entire government that made the request. Similarly, though the modern 1937 Irish constitution grants to the Taoiseach the right to make the request, the earlier 1922 Irish Free State Constitution vested the power in the Executive Council (the then name for the Irish cabinet). In Australia, the Prime Minister is expected to step down if they lose the majority support of their party under a spill motion as have many such as Tony Abbott, Julia Gillard, Kevin Rudd and Malcolm Turnbull. Organisational structure The Prime Minister's executive office is usually called the Office of the Prime Minister or Cabinet Office. The U.K.’s Cabinet Office includes the Prime Minister’s Office. Conversely, some Prime Minister's Offices incorporate the role of Cabinet, while Australia’s Department of the Prime Minister and Cabinet joins them at par. In Israel, the Prime Minister's executive office is officially titled the "Prime Minister's Office" in English, but the original Hebrew term can also be translated as the Prime Minister's Ministry. The Prime Minister's Department is also used, as is Cabinet Department. Description of the role Wilfried Martens, who served as Prime Minister of Belgium, described his role as follows: First of all the Prime Minister must listen a lot, and when deep disagreements occur, he must suggest a solution to the matter. This can be done in different ways. Sometimes