Incident Response Testing is the requirement that proves your incident response capability actually works before a real incident forces the question. Incident Handling (03.06.01) builds the capability and the Incident Response Plan (03.06.05) documents it, while Incident Response Testing (03.06.03) exercises it on a defined schedule. It is a single statement: test the effectiveness of the incident response capability on a defined frequency. Per the NIST discussion, testing includes checklists, walk-through or tabletop exercises, and simulations, and it can determine the effects of incident response on operations, assets, and individuals using qualitative and quantitative data.
A common difficulty with this requirement is having a plan but never exercising it, or running an exercise once and never again. R3 ties the testing to a frequency through an Organization-Defined Parameter (ODP), so a one-time tabletop does not satisfy the recurring expectation. For Department of Defense (DoD) contractors, that frequency is specified.
Where things stand for companies facing the transition from NIST 800-171 R2 to R3:
The following is reproduced verbatim from NIST 800-171 R3, requirement 03.06.03 Incident Response Testing. Only the formatting has been adjusted for readability. This is a single statement with no lettered parts:
The source control is IR-03 from NIST 800-53. The bracketed assignment is the Organization-Defined Parameter (ODP): the testing frequency. Per the NIST discussion, organizations test incident response capabilities to determine their effectiveness and identify weaknesses or deficiencies. You can read the requirement directly at NIST 800-171 R3, 03.06.03 (p. 40).
One (1) value sits inside this requirement. Depending on your contract, your organization may be permitted to define it. Organizations in the DIB subject to CMMC are not, because the DoD has defined it as policy.
The value below comes from Attachment A of the DoD Chief Information Officer (CIO) memorandum dated 10 April 2025 (signed David W. McKeown). The memo identifies each parameter by requirement sub-part, while NIST 800-171A R3 identifies the same parameter by ODP number. Both identifiers appear below so you can match your System Security Plan (SSP) language to either document.
The memo states that its values "will be updated as necessary," so confirm against the current version before writing them into policy.
NIST 800-171A R3 breaks 03.06.03 into two (2) assessment objectives: one (1) Organization-Defined Parameter (ODP) and one (1) determination statement. These AOs are:
The objective is that the capability is tested at the defined frequency. If you are a DoD contractor, the ODP is specified. Per the DoD-specified ODP value in ComplianceForge's NIST 800-171 R3 Transition Guide, the testing frequency (ODP[01]) is at least every twelve (12) months. The full guidance on assessment methods and objects, is in NIST 800-171A R3, 03.06.03 (p. 51).
Examine: incident response policy and procedures; contingency planning policy and procedures; procedures for incident response testing; procedures for contingency plan testing; incident response testing material; incident response test results; incident response test plan; incident response plan; contingency plan; system security plan.
Interview: personnel with incident response testing responsibilities; personnel with information security responsibilities.
03.06.03 maps from NIST 800-171 R2 requirement 3.6.3 (test the organizational incident response capability):
Mapped against the two (2) AOs, one (1) is direct (minimal effort) and one (1) is net new (significant effort), with none indirect and none with no mapping. Testing the capability carries forward, but R3 adds a defined frequency parameter that R2 did not specify. Define the frequency, and for DoD work use the specified value rather than testing on an ad hoc basis.
Source Control in NIST 800-53 R5:
Secure Controls Framework (SCF) Crosswalk
Organizations running a single control set across multiple frameworks can satisfy 03.06.03 through the following SCF controls:
The crosswalks from NIST 800-171 R3 and NIST 800-171A R3 to the SCF are available at no cost through the SCF Set Theory Relationship Mapping (STRM): https://securecontrolsframework.com/start-here/set-theory-relationship-mapping-strm. The STRM also carries the relationship type for each mapping (Equal, Subset Of, Intersects With), which tells you whether an SCF control fully satisfies the requirement or only part of it. Mapping above taken from SCF 2026.3.
The following are issues teams may encounter rather than certainties. They are about the recurring cadence and meaningful testing, each of which needs documented evidence of due diligence and due care such as policies, standards, procedures, and configuration screenshots:
Reasonable objective evidence for an assessment is often subjective. The following examples of evidence to address NIST 800-171 R3 03.06.03 are sourced from the SCF Evidence Request List (ERL), available at https://securecontrolsframework.com/free-content/scf-download. These ERL artifacts are mapped to NIST 800-171 R3 03.06.03 through SCF controls. They establish a starting point for discussions on what an organization needs to have for evidence of due diligence and due care to withstand external scrutiny by an assessor or regulator.
Alongside these, keep the System Security Plan (SSP) narrative for 03.06.03 recording the ODP values you adopted.
With one AO mapping directly and one net new, 03.06.03 is a light lift once the cadence is set. A realistic sequence:
What value does the DoD require for the organization-defined parameter in NIST 800-171 R3 03.06.03? R3 leaves the value to the organization. For the DIB, the DoD set it in the 10 April 2025 memorandum under ODP identifier 03.06.03: at least every 12 months.
How many assessment objectives does NIST 800-171 R3 03.06.03 have? NIST 800-171A R3 breaks 03.06.03 into two (2) assessment objectives: one (1) Organization-Defined Parameters (ODPs) and one (1) determination statements. An assessor works through each one separately, so each needs its own evidence.
Which NIST 800-53 R5 control does NIST 800-171 R3 03.06.03 come from? IR-03.
Where does NIST 800-171 R3 03.06.03 sit in the NIST 800-171 R3 Kill Chain? Phase 10, Incident Response (IR). The Kill Chain is a phased model for sequencing R3 implementation, and it assigns this requirement to that phase.
03.06.03 Incident Response Testing tests the effectiveness of the incident response capability on a defined frequency. It maps directly from R2 3.6.3, with R3 adding a defined frequency parameter. The recurring problem is a one-time exercise. Set the testing frequency (for DoD, at least every twelve months), run meaningful tests, and feed the results back into your plan.
Authoritative sources:
Authoritative sources:
This guide reproduces U.S. Government text from NIST 800-171 R3 and NIST 800-171A R3 and references the DoD ODP memorandum of 10 April 2025. It is educational, not legal or assessment advice. Last reviewed: 2026-09-22.
