 In practice that means that the leader of the party (or coalition of parties) with a majority of members in the House becomes the Prime Minister, who then can nominate other elected members of the government party in both the House and the Senate to become ministers responsible for various portfolios and administer government departments.Bills appropriating money (supply bills) can only be introduced in the lower house and thus only the party with a majority in the lower house can govern.In the current Australian party system, this ensures that virtually all contentious votes are along party lines, and the Government usually has a majority in those votes.