(a) Invalid regulation means a regulation that has been issued by OPM, and that, on its face, would require an employee to commit a prohibited personnel practice if any agency implemented the regulation.

(b) Invalidly implemented regulation means a regulation, issued by OPM, whose implementation by an agency has required an employee to commit a prohibited personnel practice. A valid regulation may be invalidly implemented.

(c) Merit system principles are the principles stated in 5 U.S.C. 2301(b)(1) through 2301(b)(9).

(d) Pleadings are written submissions containing claims, allegations, arguments, or evidence. They include briefs, motions, requests for regulation review, responses, replies, and attachments that are submitted in connection with proceedings under this part.

(e) Prohibited personnel practices are the impermissible actions described in 5 U.S.C. 2302(b)(1) through 2302(b)(12).

(f) Regulation review means the procedure under which the Board, under 5 U.S.C. 1204(f), reviews regulations issued by OPM on their face, or reviews those regulations as they have been implemented, or both, in order to determine whether the regulations require any employee to commit a prohibited personnel practice.

(g) Request for regulation review means a request that the Board review a regulation issued by OPM.