Icologiq Knowledge · Method
Risk Matrix
A grid that combines likelihood and consequence or severity ratings to support consistent risk evaluation and prioritization.
Also known as:
risk assessment matrix, likelihood consequence matrix, probability severity matrix
At a glance
Type
Method
Topic
Risk
Applies to
Cross-industry
Current version
Status
Last reviewed
September 29, 2026
Definition
A risk matrix is a qualitative or semi-quantitative tool that combines defined likelihood and consequence or severity categories to assign a risk level. Organizations use risk matrices to support prioritization and escalation, but the result depends on the criteria, scales and assumptions chosen. A matrix therefore supports risk judgement rather than replacing it.
Why it matters
Quality and QHSE teams use risk matrices across incidents, audits, changes, supplier decisions and operational risk assessments. When every department uses different scales or undocumented judgement, risk rankings become hard to compare. A controlled matrix with clear criteria and traceable assessments makes prioritization more consistent while preserving the rationale behind the rating.
Use descriptions that fit the organization and decision context so different assessors interpret categories consistently.
Define likelihood and consequence scales
1
Map category combinations to risk levels and make clear what treatment, approval or escalation each level implies.
Define rating and decision rules
2
Describe the event and consequences clearly before selecting likelihood and consequence values.
Assess a specific risk scenario
3
Be clear whether the rating reflects inherent risk, current controls, residual risk or another agreed basis.
Consider existing controls explicitly
4
Record enough reasoning for another reviewer to understand important assumptions and data limitations.
Document judgement and uncertainty
5
Reassess after treatment, incidents, operational change or new evidence rather than leaving the rating static.
Review when conditions change
6
Method explained
Using a Risk Matrix consistently
A Risk Matrix combines defined likelihood and consequence categories to support consistent risk comparison. It is a decision aid rather than a precise measure, so category definitions, assumptions and escalation rules matter as much as the colored grid.
A structured assessment used to identify hazards or uncertainties, estimate their risk and determine whether controls or further action are required.
Risk Assessment
Process
· Risk
The coordinated process of identifying, assessing, treating, monitoring and communicating risks that could affect objectives, safety, quality or compliance.
Risk Management
Process
· Risk
A structured, team-based study that uses guide words to identify deviations from design intent that could create hazards or operability problems.
HAZOP
Method
· Process Safety
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