(1) Constitutional powers conferred on the President under section 84(2) as head of state do not constitute 'administrative action' as contemplated in section 33 because they relate to policy formation rather than implementation of legislation; the test is the function performed, not the identity of the functionary. (2) Even though such powers are not 'administrative action', they remain subject to constitutional constraints including the doctrine of legality, good faith, the Bill of Rights, and requirements such as consultation with the Deputy President (where applicable). (3) Any purported abdication of constitutional powers vested personally in the President would be invalid and void, and therefore could not be irrevocable; the validity of the exercise of presidential power must be assessed at the time it is exercised (when promulgated), not at some earlier point. (4) A Minister cannot, by contract or otherwise, fetter the President's exercise of powers vested in the President personally by the Constitution. (5) Whether a matter is one of 'public concern' for purposes of the Commissions Act is an objective question for the courts to determine; 'public concern' means a matter about which a significant segment of the public is concerned, not merely interested. (6) The affairs of private organizations may constitute matters of public concern where they affect the public and give rise to legitimate public interest and concern. (7) Courts should not order the President to give oral evidence in civil matters relating to official duties except in exceptional circumstances; the separation of powers requires courts to protect the status, dignity and efficiency of the presidential office. (8) Under the rule in Browne v Dunn, where a witness's credibility is to be challenged, the witness must be given an opportunity to respond while in the witness box; failure to properly challenge evidence in cross-examination precludes later rejection of that evidence on credibility grounds.