FAQGlobalISO/IEC 27005

ISO/IEC 27005 FAQ Likelihood

Answer likelihood questions with explicit owner, evidence, and escalation expectations for ISO/IEC 27005.

Applied to this decision area, this page focuses on scope, ownership, evidence, review triggers, and escalation criteria supported by source-linked risk-management guidance.

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Author
Sorena AI
Published
May 9, 2026
Updated
May 9, 2026
Questions
4

Structured answer sets in this page tree.

Primary sources
3

Cited legal and guidance references.

Publication metadata
Sorena AI
Published May 9, 2026
Updated May 9, 2026
Overview

This ISO/IEC 27005 Likelihood FAQ helps teams determine what must be owned, what evidence must be present, and when review or escalation is required.

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4 of 4 questions
Question 1

How should teams handle Likelihood under ISO/IEC 27005?

Start with one decision record: scope, required inputs, owner, evidence location, and review condition. Then route the result to treatment or acceptance gates.

For risk work, separate the model from the result: risk criteria, scenario assumptions, Likelihood rationale, impact rationale, existing controls, treatment choice, residual risk, and acceptance authority. This keeps the answer useful in audits, customer reviews, incidents, supplier reviews, and management review.

  • Name the accountable owner and reviewer for Likelihood.
  • Record the scope, assumptions, decision, approval date, evidence location, exception status, and next review trigger.
  • Escalate when Likelihood changes risk acceptance, service commitments, customer promises, regulatory duties, or certification evidence.
Citations
ISO/IEC 27005:2022 standard page

Primary ISO listing for ISO/IEC 27005, cited because likelihood must be defined inside a structured information-security risk management process that supports an ISO/IEC 27001 ISMS.

Question 2

What evidence should prove Likelihood is current under ISO/IEC 27005?

The evidence should show the process operating. For this artifact, the strongest record usually includes risk criteria, scenarios, Likelihood and impact rationale, treatment decisions, residual-risk approvals, and review records.

Avoid evidence that only repeats a requirement. A reviewer should be able to see the actual owner, date, system, supplier, AI system, service, incident, risk, or control sample behind the answer.

  • Use source records from the system of work, not screenshots created only for audit day.
  • Keep exceptions visible as risk acceptance, corrective action, or management-review input.
  • Update linked registers when the answer changes an owner, risk, control, service, supplier, or review date.
Citations
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Question 3

Who should approve Likelihood decisions under ISO/IEC 27005?

The person who can fund, operate, and correct the process should own the decision; governance should review consistency and exceptions.

For high-impact changes, approval should include the teams affected by the evidence: security, privacy, resilience, supplier management, AI governance, legal, risk, or business service owners as relevant.

  • Use a named owner, named backup, and named escalation forum.
  • Separate preparation work from risk acceptance and final approval.
  • Keep approval records with the evidence rather than in disconnected email threads.
Citations
Question 4

When should Likelihood be reviewed under ISO/IEC 27005?

Review it at planned intervals and whenever the underlying scope, service, supplier, control, risk, AI system, personal data flow, incident process, or customer commitment changes.

A stale record is worse than a short record. If the facts change, update the evidence and mark what changed so the next reviewer can trust the page.

  • Set a planned review date and a change-trigger rule.
  • Use findings to update controls, procedures, contracts, risk registers, or training.
  • Carry unresolved items into management review or risk acceptance.
Citations
Primary sources

References and citations

ISO/IEC 27001:2022 standard page
iso.org
Referenced sections
  • Primary ISO listing for the current ISO/IEC 27001 ISMS requirements standard.
"Information security management systems - Requirements"
ISO/IEC 27005:2022 standard page
iso.org
Referenced sections
  • Primary ISO listing for current ISO/IEC 27005 risk-management guidance.
"Guidance on managing information security risks"
NIST SP 800-30 Rev. 1
nvlpubs.nist.gov
Referenced sections
  • NIST risk-assessment guidance used for comparison with ISO/IEC 27005.
"Guide for Conducting Risk Assessments"
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