ISO 27001 Annex A 5.9: Inventory of information and other associated assets

What Control 5.9 means in practice

A complete, owned and current view of information, systems, applications, cloud services and supporting assets. Test the control through the organisation's actual scope, decisions, ownership and operating records rather than relying on a policy reference alone.

For inventory of information and other associated assets, proportional design depends on the affected services, information, people and dependencies. The evidence below should be adapted to that real boundary.

Implementation steps

1. Step 1. Define included asset types and inventory boundaries.
2. Step 2. Maintain information, system, application, cloud-service and other relevant asset records.
3. Step 3. Assign owners and connect assets to business processes, classification and risk.
4. Step 4. Use onboarding, change and decommissioning triggers to reconcile the inventory.

What good implementation looks like

• recent additions and retirements traced through the inventory
• unowned or stale asset reports and their resolution
• inventory reconciliation results across discovery, finance and cloud sources

Implementation evidence and effectiveness evidence

How an auditor may test Control 5.9

1. Select a representative in-scope service, asset or process.
2. Confirm the accountable owner and expected operation.
3. Trace a recent example: A newly purchased SaaS service is recorded with its owner, information type and review date.
4. Inspect the operating record and corroborating technical evidence.
5. Compare the design with evidence that the control operated effectively.
6. Follow an exception or adverse result through decision and closure.
7. Review trends, metrics and improvement decisions.

Questions to prepare for

• How do you identify information assets within scope?
• How are owners assigned?
• Show an asset added or retired recently.
• How are cloud-hosted and outsourced assets kept current?

Practical examples

Illustrative decision and evidence record

Reviewer note: Reconcile the inventory against procurement, identity, cloud and change records; no single discovery source will reveal every relevant asset.

Useful performance and coverage measures

• percentage of in-scope assets with an owner
• unreconciled assets by age
• time from acquisition to inventory entry

Approach for smaller and mature organizations

Smaller organization

Use a clear owner, a proportionate working record, built-in platform capability and a scheduled review. Sample real activity instead of creating duplicate paperwork for inventory of information and other associated assets.

Mature or complex organization

Define service-level ownership, automated coverage reporting, integrated workflow, risk-based exceptions and independent assurance across business units and technology platforms.

Practical implementation checklist

• □ Define included asset types and inventory boundaries.
• □ Maintain information, system, application, cloud-service and other relevant asset records.
• □ Assign owners and connect assets to business processes, classification and risk.
• □ Use onboarding, change and decommissioning triggers to reconcile the inventory.
• □ Sample evidence has been checked for operation and effectiveness.
• □ Exceptions have owners, rationale, review dates and closure evidence.

Common implementation mistakes

• inventory covers hardware only
• cloud services or virtual assets are omitted
• ownership is missing
• the spreadsheet is not reconciled with change or decommissioning

Related controls, clauses and resources