Event Tree Analysis (ETA): Complete ISO 31010 Risk Assessment Guide
Event Tree Analysis (ETA) is a quantitative risk assessment technique used to analyze how an initiating event can evolve into different outcomes depending on the success or failure of controls, barriers and response actions.
Key Takeaways
- ✓ETA analyzes how events develop after an initiating event.
- ✓It is a recommended ISO 31010 risk assessment technique.
- ✓It evaluates barrier effectiveness.
- ✓It supports safety, operational and cybersecurity analysis.
Event Tree Analysis (ETA): Risk Assessment Technique
Executive Summary
Event Tree Analysis (ETA) is a risk assessment technique used to model how an initiating event can develop into different consequences depending on the performance of safety barriers, controls and response actions.
The technique is included in ISO 31010 Risk Management — Risk Assessment Techniques and is widely used in industries where safety, reliability and operational resilience are critical.
ETA helps organizations answer important questions:
- What can happen after an initiating event?
- Which barriers can prevent or reduce consequences?
- What are the possible final scenarios?
- What probability is associated with each outcome?
Event Tree Analysis at a Glance
| Element | Description |
|---|---|
| Category | Risk assessment technique |
| Related Standard | ISO 31010 |
| Analysis Type | Inductive |
Related topics
Frequently asked questions
What is Event Tree Analysis?
It is a risk assessment technique that analyzes possible consequences after an initiating event.
What is the difference between ETA and FTA?
ETA starts from an initiating event and explores consequences, while FTA starts from a consequence and investigates causes.
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