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ISO 27001 Annex A 5.22: Monitoring, Review and Change Management of Supplier Services – Practical Implementation Guide

ISO/IEC 27001:2022 Annex A · Control 5.22

Monitoring, Review and Change Management of Supplier Services: A Practical Implementation Guide

Verify that supplier security remains effective as services, risks and dependencies change.

This control concerns monitoring and reviewing supplier services and managing changes that may affect information security.

Practical interpretation: Approval at onboarding has a limited shelf life. Assurance, incidents, performance, ownership, technology and subcontractors change during the relationship.

What should the control achieve?

  • Monitoring depth reflects supplier criticality.
  • Assurance and performance are reviewed on schedule.
  • Material changes trigger risk assessment.
  • Findings have owners, deadlines and escalation.

Step-by-step implementation

1

Define monitoring plans

Specify evidence, frequency, owner and escalation by supplier tier.

2

Collect assurance

Review reports, certifications, tests, incidents, SLA data and control attestations.

3

Assess performance

Compare evidence with contractual requirements and current risk.

4

Manage findings

Record severity, remediation, due date, compensating controls and acceptance.

5

Control changes

Require notification of material service, location, ownership, technology or subprocessor changes.

6

Report and renew

Use results in management reporting, renewal and exit decisions.

What this could look like in practice

A critical SaaS provider is reviewed quarterly. The owner checks availability, incidents, assurance reports and open findings. A new hosting region triggers Privacy and Security review before customer data moves.

ActivityPractical implementationEvidence
Quarterly reviewOwner evaluates SLA, incidents and findings.Review minutes
Assurance reportSecurity maps exceptions to organizational risk.Assessment record
Material changeSupplier change notice enters risk workflow.Change approval

Implementation evidence

  • Supplier monitoring plans
  • Review schedules
  • Assurance assessments
  • Performance reports
  • Finding tracker
  • Change notifications
  • Risk reassessments
  • Renewal decisions

Useful metrics

  • Critical reviews completed on time
  • Open supplier findings by severity
  • Unassessed material changes
  • Repeated SLA or control failures

Common mistakes

  • Collecting reports without evaluating exceptions.
  • Leaving findings with no owner.
  • Treating certification expiry as the only trigger.
  • Accepting supplier changes silently.
  • Renewing despite unresolved risk without approval.

Questions an auditor may ask

  • What is monitored for each supplier tier?
  • Show assessment of an assurance report.
  • How are material changes identified?
  • How do findings affect renewal?
Implementation test: Select a supplier change and demonstrate notification, impact assessment, decision, implementation and updated records.

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This independent educational guide paraphrases the practical intent of the control and does not replace the official ISO standards, professional advice or an organization-specific risk assessment. It is not affiliated with or endorsed by ISO.