The Crown is responsible for appointing a Prime Minister. In accordance with unwritten constitutional conventions, the Monarch or Governor-General must appoint the individual most likely to maintain the support of the House of Representatives: usually, the leader of the party which has a majority in that House. If no party has a majority, two or more groups may form a coalition, whose agreed leader is then appointed Prime Minister. In a Parliament in which no party or coalition holds a majority, the Crown is required by convention to appoint the individual most likely to command the support of the House of Commons, usually, but not necessarily, the leader of the largest party. Situations can arise in which the Governor-General's judgement about the most suitable leader to be Prime Minister has to be brought into play. The Queen is informed by the Governor-General of the acceptance of the resignation of a prime minister and the swearing-in of a new prime minister and members of the Ministry.