(a) This part covers senior-level (SL) and scientific and professional (ST) positions that are classified above GS-15 and are paid under 5 U.S.C. 5376. See 5 CFR part 534, subpart E, for pay provisions.

(b) Positions that meet the criteria for placement in the Senior Executive Service (SES) under 5 U.S.C. 3132(a) may not be placed in the SL or ST system and are not covered by this part.

(a) SL positions are positions classified above GS-15 pursuant to 5 U.S.C. 5108 that are not covered by other pay systems (e.g. the SES and ST systems).

(b) Positions in agencies that are excluded from 5 U.S.C. chapter 51 (Classification) under section 5102(a), or positions that meet one of the exclusions in section 5102(c), are excluded from the SL system.

(c) SL positions in the executive branch are in the competitive service unless the position is excepted by statute, Executive order, or the Office of Personnel Management (OPM).

(a) ST positions are established under 5 U.S.C. 3104 to carry out research and development functions that require the services of specially qualified personnel.

(b) Research and development functions are defined in The Guide to Personnel Data Standards under the data element “Functional Classification.” The guide is available for inspection at the Office of Personnel Management library, 1900 E Street, NW., Washington DC 20415.

(c) An ST position must be engaged in research and development in the physical, biological, medical, or engineering sciences, or a closely related field.

(d) ST positions are in the competitive service.

Provisions in statute, Executive order, or regulations that relate in general to competitive and excepted service positions and employment apply to positions and employment under the SL and ST systems unless there is a specific provision to the contrary.

Agencies shall report such information as may be requested by OPM relating to SL and ST positions and employees.

Agency inquiries regarding criminal history must be done in accordance with the requirements under chapter 92 of title 5, U.S. Code and part 920 of this chapter.