Ministers of the Crown are responsible and accountable to the Prime Minister and Parliament in two fundamental ways: • Individually, for their performance in carrying out the responsibilities of the portfolio assigned to them by the Prime Minister. [...] Given his role as head of government, the Prime Minister has a responsibility for the effective operation of the whole of government and often has to answer in the House for the operation of all departments and agencies. [...] They are chosen and assigned by the Prime Minister on the advice of the Clerk of the Privy Council and are appointed by the Governor in Council.4. [...] As a result of their role in the collective management of the government, deputy ministers are also accountable to the Prime Minister for responding to the policies of the Ministry as a whole and to the requirements of the Treasury Board and the Public Service Commission. [...] Ministers are personally responsible for arranging replacements if they have to be absent and for notifying the Leader of the Government in the House of Commons and the Chief Government Whip of the arrangements.