(a) Notwithstanding section 5107 of this title, the Office of Personnel Management may- (1) ascertain currently the facts as to the duties, responsibilities, and qualification requirements of a position; (2) place in an appropriate class and grade a newly created position or a position coming initially under this chapter; (3) decide whether a position is in its appropriate class and grade; and (4) change a position from one class or grade to another class or grade when the facts warrant. The Office