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NIST Special Publication 800-53A, “Assessing Security and Privacy Controls in Information Systems and Organizations”, is the NIST publication that tells assessors how to check whether the controls in SP 800-53 are actually in place and working. It supplies the methodology and the assessment procedures; SP 800-53 supplies the controls being assessed. The current edition is Revision 5, published January 25, 2022, with a minor release (5.2.0) issued August 27, 2025. Details below were checked against the official NIST publication on 2026-10-29.
What NIST SP 800-53A is and who publishes it
What is NIST 800-53A?
It is a methodology and a set of procedures for assessing security and privacy controls employed within systems and organizations, within an effective risk management framework. NIST’s own abstract says the procedures are executed at various phases of the system development life cycle, are consistent with the controls in NIST SP 800-53 Revision 5, and are customizable so organizations can tailor assessments to their risk tolerance. It also gives guidance on building assessment plans and analyzing assessment results.
Which edition is current?
Revision 5 (Joint Task Force, final January 25, 2022; DOI 10.6028/NIST.SP.800-53Ar5) supersedes Revision 4 of December 18, 2014. The August 27, 2025 minor release 5.2.0 added new assessment procedures for SA-15(13), SA-24 and SI-02(07). NIST describes the Revision 5 update as adding procedures for newly added and updated privacy and supply chain risk management controls, and as introducing a new structure for assessment procedures that supports automated tools. The procedures are published in CSV, plain text and OSCAL formats.
Who uses it
NIST says the procedures can be tailored to the needs of organizations and assessors, and that they support control assessments within the risk management framework, continuous monitoring and ongoing authorization. Its readers are assessors, who use the procedures to test a control, and the teams being assessed. For research institutions, the controls themselves are covered in the NIST 800-53 Rev. 5 guide; how related assessments work under other frameworks is covered in the guides on NIST 800-171 for CUI in university research and the CMMC Level 2 assessment.
How an assessment procedure is built: objectives, determinations, methods and objects
Section 2.4 of the publication defines an assessment procedure as a set of assessment objectives, each with an associated set of potential assessment methods and assessment objects. An assessment objective includes one or more determination statements related to the control under review. Reading a procedure therefore follows a chain: control, then objective, then determination statement, then the methods and objects used to reach that determination.
How are determination statements numbered?
The publication uses square brackets to mark granularized items. Its worked example is AC-17 (Remote Access), where an item such as AC-17a.[01] points to a specific part of the control text, so each determination can be traced back to the sentence in SP 800-53 it tests.
Assessment objects
- Specifications: document-based artifacts such as policies, procedures and plans.
- Mechanisms: hardware, software and firmware safeguards.
- Activities: protection-related actions involving people, for example backup operations or exercising a contingency plan.
- Individuals: the people who apply the specifications, mechanisms and activities.
Assessment methods
- Examine: reviewing, inspecting, observing, studying or analyzing assessment objects (specifications, mechanisms, activities).
- Interview: holding discussions with individuals or groups.
- Test: exercising one or more assessment objects (activities or mechanisms) under specified conditions to compare the actual state with the desired state or expected behavior.
Not every procedure uses all three methods. The publication leaves it to the organization to determine the methods needed.
Depth and coverage: how much effort an assessment takes
Two attributes set the level of effort. Depth is the rigor and level of detail; coverage is the scope and breadth. Each takes one of three values: basic, focused or comprehensive. The publication states that the level of effort is primarily determined by the privacy risk assessment or the security categorization, rather than being set the same way for every control.
Assessment steps
Chapter 3 organizes the process into five tasks:
- Prepare for security and privacy control assessments (section 3.1).
- Develop security and privacy assessment plans (3.2).
- Conduct security and privacy control assessments (3.3).
- Analyze assessment report results (3.4).
- Assess security and privacy capabilities (3.5).
Because the procedures can be executed at various phases of the system development life cycle, the same procedure may be used early, to check a design, and later, to check an operating system. NIST does not prescribe calendar durations for these tasks.
Findings: satisfied and other than satisfied
In section 3.3, each determination statement is recorded as either “satisfied” (S) or “other than satisfied” (O). For an O finding, the assessor indicates which parts of the control are affected and notes the associated risk. A finding is therefore a statement about a specific part of a control, not a pass or fail grade for the whole control.
Common mistakes
- Using the superseded edition. Revision 4 (2014) was superseded by Revision 5; procedures should match the revision of SP 800-53 whose controls are being assessed.
- Assuming every procedure needs examine, interview and test. The publication says not all procedures include all three methods.
- Setting depth and coverage without reference to risk. The publication ties level of effort to the privacy risk assessment or security categorization.
- Recording an “other than satisfied” finding without the affected part and the risk. Both are expected for O determinations.
- Missing the 2025 additions. Summaries written before August 27, 2025 do not list the procedures added in release 5.2.0.
Related publications
| Publication | Relationship to SP 800-53A Rev. 5 |
|---|---|
| SP 800-53 Rev. 5 | The security and privacy controls that the assessment procedures are consistent with; named by NIST as a companion publication. |
| SP 800-53B | Named by NIST as a companion publication. |
| SP 800-53A Rev. 4 (December 18, 2014) | The previous edition, superseded by Revision 5. |
| OSCAL content (NIST GitHub) | Machine-readable form of the assessment procedures. |
For risk analysis context, see the CASRAI guide to NIST SP 800-30.
FAQ
What is NIST 800-53A in one sentence?
It is NIST’s methodology and set of assessment procedures for testing the security and privacy controls in SP 800-53.
What is NIST 800 53A Revision 5 and when was it released?
It is the current edition, titled “Assessing Security and Privacy Controls in Information Systems and Organizations”, final on January 25, 2022, with minor release 5.2.0 on August 27, 2025.
What are the three assessment methods?
Examine, interview and test.
Can the procedures be tailored?
Yes. NIST describes them as customizable and tailorable to the needs of organizations and assessors.
Is there a machine-readable version?
Yes. The procedures are published in CSV, plain text and OSCAL, and NIST links OSCAL content on GitHub.
Sources
- NIST CSRC, SP 800-53A Rev. 5 publication page, csrc.nist.gov/pubs/sp/800/53/a/r5/final, checked 2026-10-29.
- NIST, SP 800-53A Rev. 5 full text, nvlpubs.nist.gov (PDF), sections 2.4 and 3.1 to 3.5, checked 2026-10-29.
- NIST news, “NIST Updates Security and Privacy Control Assessment Procedures”, nist.gov, checked 2026-10-29.
