Accountability should sit with the certification owner, who oversees timing, reviewer assignment, and completion. Reviewers make the access decisions, while the owner ensures the process closes on schedule and produces evidence. For audit purposes, the organisation should treat the completed certification record as proof that access was reviewed and actions were taken.
Why This Matters for Security Teams
access review only work when one person is accountable for closure, evidence, and follow-through. In Google Workspace, that is usually the certification owner, not the reviewer. Reviewers decide whether access remains justified, while the owner ensures the campaign starts on time, reaches the right people, and ends with a defensible record for audit and remediation.
This distinction matters because governance failures are often procedural, not technical. If ownership is unclear, certifications stall, exceptions linger, and evidence becomes fragmented across tickets, emails, and spreadsheets. NHI Management Group’s Ultimate Guide to NHIs notes that 97% of NHIs carry excessive privileges, which is a reminder that review processes must close the loop, not just ask for opinions. The control objective is closer to NIST SP 800-53 Rev 5 Security and Privacy Controls than a simple approval task: accountability, traceability, and evidence retention all need an owner.
In practice, many security teams discover the ownership gap only after a late certification, an incomplete audit sample, or a reviewer who never realized they were also expected to preserve the record.
How It Works in Practice
A workable Google Workspace access review process separates three responsibilities. The certification owner runs the campaign, defines scope, assigns reviewers, tracks due dates, and confirms the record is complete. Reviewers evaluate whether each user, group, or admin privilege still has a business need. Evidence is then preserved in the final certification record, which should show the scope, decision, timestamp, and any remediation action.
That structure aligns with the spirit of the OWASP Non-Human Identity Top 10, even when the asset being reviewed is a human access path inside a cloud platform. The practical question is not only who approved what, but whether the organisation can prove review completion and follow-up. For identity evidence, the safer pattern is to retain the completed certification artifact itself rather than rely on side-channel emails or manual notes.
Operationally, the owner should ensure the review is tied to a defined population, such as privileged admins, sensitive shared drives, external collaborators, or groups with elevated access. If the workflow supports attestations, the owner should verify that each entry has a disposition of approve, revoke, or exception with an explanatory note. If revocations are required, the closure step should confirm the change was executed and captured in the record.
- Owner: launches the review, sets deadlines, and confirms completion.
- Reviewer: makes the access decision for each item.
- Evidence custodian: keeps the completed certification record accessible for audit.
- Remediation owner: executes revocations and records closure when changes are required.
The strongest implementations also link the review to a control library or audit repository so the final record can be retrieved quickly during testing. This guidance breaks down in highly delegated environments where multiple business units can override access decisions and no single party controls the final certification record.
Common Variations and Edge Cases
Tighter evidence requirements often increase administrative overhead, requiring organisations to balance audit readiness against reviewer fatigue. That tradeoff is real, especially when Google Workspace reviews span many groups, domains, or delegated admin models.
Best practice is evolving on whether the certification owner must also be the evidence custodian, or whether those duties can be split. Current guidance suggests the owner should remain accountable for completion, while a separate governance or compliance function may archive the final artifact. What should not be split is accountability for closure: if the review is incomplete, there should still be one named owner responsible for remediation and reissue.
Edge cases usually appear when access is inherited through groups, nested groups, or shared admin roles. In those cases, the reviewer should be evaluating effective access, not just direct assignments. For broader identity governance context, the Ultimate Guide to NHIs is useful for understanding why visibility and lifecycle discipline matter, and the NHI Lifecycle Management Guide reinforces the need to keep records tied to creation, review, and offboarding decisions. Where organisations rely on informal sign-off, evidence quality usually falls apart during audit sampling or after a personnel change leaves the original owner unavailable.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
OWASP Non-Human Identity Top 10 and CSA MAESTRO address the attack and risk surface, while NIST CSF 2.0, NIST SP 800-63 and NIST AI RMF set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST CSF 2.0 | GV.RM-01 | Clarifies governance accountability for review ownership and evidence retention. |
| NIST SP 800-63 | Supports identity proofing and lifecycle discipline behind access certification records. | |
| OWASP Non-Human Identity Top 10 | NHI-08 | Review evidence and lifecycle control reduce excessive or stale non-human access. |
| NIST AI RMF | GOVERN | Accountability and documentation are core to governance of automated access decisions. |
| CSA MAESTRO | GOV-01 | Agent governance principles map to clear ownership and traceable review outcomes. |
Assign a named control owner and retain completed review records as auditable evidence.
Related resources from NHI Mgmt Group
- Who is accountable for completing access reviews and preserving evidence for audit purposes?
- Who is accountable when access approvals and review reminders move into collaboration platforms?
- Who is accountable when user access reviews are incomplete or not evidence-ready?
- When should organizations review access controls?
Deepen Your Knowledge
Reviewed and updated by the NHIMG editorial team on August 28, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
