102-192.20—How are “must” and “should” used in this part?

In this part—
(a) “Must” identifies steps that Federal agencies are required to take; and
(b) “Should” identifies steps that the General Services Administration (GSA) recommends.

Code of Federal Regulations

Note to § 102-192.20 : In their internal policy statements, agencies may require steps that GSA recommends. However, agencies may not change required steps into non-mandatory recommendations.