Direct answer
For each security control, identify who is accountable, who operates it, what evidence shows it is working and when it is reviewed. Resolve shared responsibilities explicitly rather than assuming a tool or vendor is the owner.
Describe the intended control
A control might require privileged access to production to be approved and periodically reviewed. Specify the systems and identities covered, the expected behavior and relevant policy. A product name alone is not an operational control description.
Reference: NIST Cybersecurity Framework 2.0.
Map accountability
The identity team may operate the access system while a service owner approves membership and security reviews exceptions. Record these roles and a backup contact. For outsourced services, keep an internal owner responsible for the customer-controlled part.
- Name the accountable owner and operator.
- Identify dependencies and evidence locations.
- Set a review date and escalation contact.
Choose useful evidence
For access reviews, evidence could include a dated membership list, reviewer decision and change reference. Restrict the record because it may reveal privileged identities. A policy document alone does not show that a review actually occurred.
Reference: NIST SP 800-30 Rev. 1: Guide for Conducting Risk Assessments.
Revisit after change
When a service or team changes, transfer open exceptions and evidence access to the receiving owner. If a review is missed, record the gap and follow-up instead of marking the control complete based on an old result.
Assessment limits
An ownership matrix improves coordination but does not prove control effectiveness. Evidence and testing must match the actual system and control objective.
Frequently asked questions
Can a vendor be the only owner?
A vendor may operate a control, but the organization should identify an internal owner for its responsibilities and oversight.
Is a written policy proof a control operated?
No. Preserve appropriate evidence of the activity and review its effectiveness.
Primary sources and further reading
These guides combine published security guidance with practical assessment planning. Adapt checks to the owner's policy, environment, and authorized scope.
This guide was prepared with AI assistance using the linked sources and illustrative examples. Check current vendor guidance and your environment before making changes.