Start with the systems, data, and processes covered by the audit, then identify every person who can access or manage them. In practice, that includes employees, contractors, and freelancers if they touch in-scope information or help run the relevant controls. A narrow scoping pass creates blind spots, while an overly broad scope wastes time and money.
What “in scope” really means for a security audit
audit scope should be driven by exposure, not job title alone. The starting point is the audited system, data, control, or process, then the people who can access it, change it, approve it, or operate the controls around it. That usually includes employees, contractors, and freelancers where their duties create real access or accountability.
The practical test is whether excluding a person would leave a gap in the audit story. If they can view sensitive records, administer a control, submit transactions, approve changes, or influence logging and monitoring, they are part of the scope conversation even if they are not permanent staff.
How to build a defensible people scope
Begin with the audit boundary, then map the human touchpoints around it: who uses the system, who supports it, who has privileged access, who reviews exceptions, and who can recover or override controls. This is usually more reliable than using HR status as a proxy, because employment type says little about actual reach into the environment.
A good scoping pass should also separate direct access from indirect influence. For example, a person who can administer a platform, approve a privileged request, or export data for reporting may be just as important to audit coverage as someone who logs in daily. The goal is to capture material control exposure, not simply headcount.
When the answer is unclear, treat the question as a control design issue and ask what evidence the audit will need to validate access, oversight, and segregation of duties. If a role can materially affect the control outcome, it belongs in scope until the audit design proves otherwise.
Where audit scoping goes wrong
Most scoping failures come from one of two errors: narrowing the population too early, or expanding it without a control reason. A narrow scope can miss contractors, temporary staff, or shared support roles that actually touch the audited process. An overly broad scope turns the audit into a census and makes evidence collection slower, noisier, and harder to defend.
Scope also becomes fragile when organisations rely on organizational charts instead of access paths. A person may sit outside the formal business unit yet still operate a critical control through delegated administration, vendor support, or exception handling. If the scoping method cannot explain those cases, the audit will be easy to challenge.
For teams working under a formal assurance regime, the same principle applies to SOC 2 Trust Services Criteria (AICPA): the people in scope are the ones who can affect the security, availability, confidentiality, processing integrity, or privacy commitments being tested.
What evidence should decide the final scope
The strongest evidence is an access and responsibility map, not a manager’s opinion. Use system entitlements, privileged access lists, approval workflows, exception logs, and operational runbooks to identify who can actually affect the audit boundary. HR records are useful, but only as a cross-check against the real operating model.
For cloud and identity-heavy environments, review the same access paths through the lens of governance and auditability. NHIMG’s Ultimate Guide to NHIs — Regulatory and Audit Perspectives and Cloud Compliance Pulse 2025 reinforce the same audit reality: access review only works when the scope reflects both ownership and effective control, not just formal reporting lines.
Risk and Threat Considerations
Audit scope errors create two different kinds of exposure. If the scope is too narrow, hidden access paths can leave privileged users, contractors, or support functions outside review; if it is too broad, teams waste effort on low-value populations and miss the material control points that matter most.
Failure mechanism: Organisations misclassify scope by org chart instead of actual access, so they overlook people who can change, approve, export, or override the in-scope control environment.
Impact: The audit may conclude on incomplete evidence, leaving unresolved access risk, weak segregation of duties, and unreliable assurance over the control set.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
NIST SP 800-53 Rev 5 and CIS Controls v8 set the technical controls, while SOC 2 (AICPA) and ISO/IEC 27001:2022 define the regulatory obligations.
| Framework | Control / Reference | Relevance |
|---|---|---|
| SOC 2 (AICPA) | CC6.1 — Logical and Physical Access Controls | People scope hinges on who can access or manage in-scope systems and data. |
| Recommendation — Include every person with meaningful access in the audit population. | ||
| NIST SP 800-53 Rev 5 | AC-2 — Account Management | Audit scope depends on identifying all users and administrators who hold active access. |
| AU-6 — Audit Record Review, Analysis, and Reporting | Scope must cover the people who can influence or review audit evidence and records. | |
| Recommendation — Verify account inventories against the audit boundary and revoke stale access. Ensure reviewers, approvers, and operators are included where they can affect audit evidence. | ||
| ISO/IEC 27001:2022 | A.5.18 — Access rights | The question is about determining who should be covered based on effective access. |
| Recommendation — Map access rights to the audit scope and confirm they match real duties. | ||
| CIS Controls v8 | CIS-5 — Account Management | Scoping depends on identifying active accounts and the people behind them. |
| Recommendation — Use account inventory to define who is actually in scope for the audit. | ||
Practitioner Guidance
What to verify: Confirm that every scoped person has a documented relationship to an in-scope system, dataset, or control process, and that contractors or freelancers are included only where their access is real and current.
Decision rule: If a person can affect the control outcome, include them until you can show that their access is immaterial, fully compensating, or out of the audit boundary by design.
Practitioner takeaway: The right scope is the smallest population that still covers every meaningful access path, accountability point, and control dependency.
Related resources from NHI Mgmt Group
Deepen Your Knowledge
Reviewed and updated by the NHIMG editorial team on September 25, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
