class
(4) “class” or “class of positions” includes all positions which are sufficiently similar, as to— (A) kind or subject-matter of work; (B) level of difficulty and responsibility; and (C) the qualification requirements of the work; to warrant similar treatment in personnel and pay administration; and
Source
5 USC § 5102(a)(4)
Scoping language
None identified. Default scope is assumed to be the entire title.