The House of Commons formally scrutinises the Government through its Committees and Prime Minister's Questions, when members ask questions of the prime minister; the house gives other opportunities to question other cabinet ministers. Prime Minister's Questions occur weekly, normally for half an hour each Wednesday. Questions must relate to the responding minister's official government activities, not to his or her activities as a party leader or as a private Member of Parliament. Customarily, members of the Government party/coalition and members of the Opposition alternate when asking questions. Members may also make inquiries in writing.