Independent Review of Information Security

It is an organizational control requiring that an organization's approach to information security is reviewed independently at planned intervals or after significant changes to ensure its continuing suitability and effectiveness.

An independent review means the assessment is conducted by someone who is not directly responsible for the design, implementation, or daily operation of the specific ISMS controls they are evaluating, ensuring an unbiased perspective.

ISO 27001 independent review frequency should be set at planned intervals (typically annually) to maintain the ISMS, and immediately following any significant changes to the organization's business, technology, or risk landscape.

Anyone who does not manage or execute the controls they are testing is considered independent. This can be an external auditor, a third-party consultant, or an internal employee from a completely different department.

Clause 9.2 mandates the formal process and programmatic requirements for an ISO 27001 internal audit of the overall ISMS, whereas A.5.35 is a specific control ensuring the technical and operational implementation is objectively reviewed, though they are often satisfied simultaneously.

A.5.35 focuses on conducting an objective, independent assessment of the security controls and approach, while Clause 9.3 requires top management to review the ISMS strategically based on the findings produced by those independent assessments.

ISO 27001 A.5.35 audit evidence examples include an internal audit report, an internal audit schedule, records of external security assessments like penetration tests, and management review minutes discussing the independent findings. Tools like WatchDog Security's Compliance Center can centralize evidence requests and collection, and WatchDog Security's Trust Center can provide controlled access to approved evidence for stakeholders.

ISO 27001 significant change review triggers include mergers and acquisitions, migrating to a new primary cloud environment, a major shift in business strategy, adopting a new technology stack, or recovering from a critical security incident.

An ISMS audit checklist or independent review report should include the audit scope, criteria evaluated, evidence sampled, identified nonconformities, opportunities for improvement, and an overall conclusion on control effectiveness.

Findings must be logged in a nonconformity and corrective action tracker, assigned a specific owner, subjected to root cause analysis, and monitored until the corrective actions are fully implemented and verified for effectiveness. WatchDog Security's Risk Register can record findings, assign treatment plans and due dates, and provide status reporting for leadership oversight.

Independent reviews often fail on execution: evidence is scattered, scope changes, and findings don’t get closed. WatchDog Security's Compliance Center helps organize the audit plan, map scope to controls, and centralize requested evidence, while WatchDog Security's Risk Register can track findings, owners, due dates, and remediation status through to verification.

Independent reviews usually require sharing sensitive reports, samples, and meeting notes with multiple parties. WatchDog Security's Secure File Sharing supports controlled distribution with TOTP verification and audit logs, and WatchDog Security's Trust Center can provide role-based access to approved evidence sets so reviewers only see what they need.