(a) The Office of Personnel Management may, for any Executive agency
(1) establish, and from time to time revise, the maximum number of positions which may at any one time be classified above GS15; and
(2) establish standards and procedures published by the Director of the Office of Personnel Management in such form as the Director may determine (including requiring agencies, where necessary in the judgment of the Office, to obtain the prior approval of the Office) in accordance with which positions may be classified above GS15.