Frameworks and controls

NIST SP 800-53, CSF 2.0 and SP 800-171 Rev. 3: how they relate, from the official data.

NIST SP 800-53 vs. SP 800-171 Rev. 3, measured from the source data
How SP 800-171 Rev. 3 derives from SP 800-53, with counts computed from NIST's OSCAL releases, the source-control links, and what that means for system design.
The CSF 2.0 to SP 800-53 mapping, and how to use it in design
What NIST's official CSF 2.0 to SP 800-53 Rev. 5.2.0 informative references contain, measured from the CPRT export, and how architects can use them without overreading.

NIST SP 800-53 vs. SP 800-171 Rev. 3, measured from the source data