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A control implementation statement is a short, specific description of how your system meets one control: who does it, what mechanism or process does it, how it is configured or performed, and where the evidence lives. A statement that answers those four questions passes validation. A statement that restates the control text in the present tense (“The organization manages information system accounts”) gets returned, because it tells the validator nothing they could not read in NIST 800-53 themselves.

Here is the structure, three worked examples, and the phrases to delete from your package tonight.

The four questions every statement answers

• Who: the role responsible (ISSO, system administrator, database administrator, the hosting provider for inherited controls). Roles, not names, since people leave.
• What: the mechanism or process. Active Directory group policy, Splunk, a documented SOP, a physical badge reader.
• How: the specific configuration, frequency, or procedure. “Accounts inactive for 35 days are disabled automatically” beats “accounts are reviewed periodically.”
• Where: the artifact that proves it, by name, so the validator can click straight to it. Naming and attaching artifacts in eMASS covers that side.

If a control has multiple CCIs, address each one. Validators test at the CCI level, and a statement that covers CCI-000015 beautifully while ignoring CCI-000016 is half a finding.

Example 1: AC-2, Account Management

Before

“The system implements account management in accordance with DoD policy. Accounts are created, modified, and removed as required. Accounts are reviewed periodically.”

After

“System administrators create, modify, and disable user accounts in Active Directory only after receiving an approved DD Form 2875 from the ISSO. Privileged accounts are placed in the Tier-0 Admins security group and require a separate admin credential. Accounts inactive for 35 days are disabled automatically by the scheduled task “Disable-StaleAccounts” and removed after 90 days. The ISSO reviews the full account list against the authorized user roster quarterly and records the review in the Account Review Log. Evidence: artifact AC-2 – Account Review Log – 2026-Q3; artifact AC-2 – Stale Account Task Screenshot – 2026-08; artifact AC-2 – DD2875 Sample (redacted) – 2026-08.”

Notice what changed: a role, a mechanism, three numbers, a named task, a frequency, and three artifacts. Every sentence is testable.

Example 2: AU-2, Event Logging

Before

“The system logs auditable events.”

After

“Windows Server 2022 hosts are configured via the Advanced Audit Policy GPO “SYS-Audit-Baseline” to log the event categories required by the Windows Server 2022 STIG (account logon, account management, logon/logoff, object access, policy change, privilege use, system). Linux hosts log the equivalent categories through auditd rules deployed from the configuration management repository. All logs forward to Splunk within five minutes. The ISSO and the system administrator review the auditable event list annually, or when a STIG revision changes the requirement. Evidence: artifact AU-2 – Audit GPO Export – 2026-08; artifact AU-2 – auditd Rules File – 2026-08; artifact AU-2 – Splunk Forwarder Config – 2026-08.”

Example 3: CM-6, Configuration Settings

Before

“STIGs are applied to all system components.”

After

“System administrators apply the current DISA STIG for each component type (Windows Server 2022, RHEL 9, Microsoft SQL Server 2022, Cisco IOS XE) using the applicable STIG benchmark in Evaluate-STIG, at build time and after each quarterly STIG release. Deviations are documented in the STIG deviation register with the ISSM’s approval and tracked as POA&M items. Compliance is verified monthly through ACAS credentialed scans with the STIG audit files enabled. Evidence: artifact CM-6 – STIG Checklists (ckl export) – 2026-08; artifact CM-6 – Deviation Register – 2026-08; artifact CM-6 – ACAS Compliance Summary – 2026-08.”

For the process behind that statement, see how to apply STIGs and what ISSOs do with ACAS results.

Inherited and hybrid controls

When a control is inherited, say so, name the provider, and reference the provider’s authorization: “PE-3 is fully inherited from the [hosting facility] common control provider under ATO dated [date]; see inherited control documentation in eMASS.” For hybrid controls, split the statement: what the provider does, then what your system does on top. Validators return hybrid controls constantly because the statement only describes the provider’s half. Control inheritance explained goes deeper.

Phrases that get controls returned

• “In accordance with policy” (which policy, and what does it say?)
• “Periodically” or “regularly” (give a frequency)
• “Appropriate personnel” (give a role)
• “Will be” or “is planned” (that is a POA&M item, not an implementation)
• “See SSP” with no section reference
• Any sentence copied verbatim from the control text

How long should a statement be?

Long enough to answer the four questions for every CCI, and not one sentence longer. Three to eight sentences covers nearly every control. If you are writing paragraphs of background, move the background to the SSP and reference the section. Validators are reading hundreds of these; brevity is a courtesy they repay with faster approvals.

A reusable template

“[Role] [does what] using [mechanism], configured to [specific setting or procedure], [at what frequency or trigger]. [Any exception handling or documentation]. Evidence: [artifact name 1]; [artifact name 2].”

Fill that in for every control and CCI in your baseline, and your package reads like it was written by someone who runs the system rather than someone who read about it. That difference is the whole game. It is also the difference between a validation that takes two weeks and one that takes two months, which the SSP writing guide covers at the document level.

Want the full ordered list of what every step of the package needs? The RMF Checklist is the printable version.