Description
Event Tree Analysis (ETA) is a method that examines the consequences of a particular event. Starting from an initial event, the tree is divided into two branches, whereby the upper one represents a positive and the lower one a negative development (event trees are usually drawn from left to right). Repeated branching of the tree shows possible effects of an initial event on a system. The aim of ETA is the identification of possible damage events.
Effort
Medium
Complexity
Medium
Method Type
Quantitative
Semi-Quantitative
Qualitative
ISO 31000
Risk Analysis - Consequences
Risk Analysis - Likelihood
Prerequisites
- Sufficient information about the examined system
Basic Approach
- Define the initial event
- Carry out a system analysis
- Define the subsequent event
- Determine the probability of the positive or negative consequence (quantitative approach)
- Repeat steps 3 and 4 for all paths of the tree
- Suggested software: Microsoft Visio & Edraw Max
Advantages
- ETA is a method that can be learned quickly
- Clear and comprehensible presentation of very complex contexts
- Very structured and methodical approach
Disadvantages
- ETA can become very extensive for longer paths
- Each ETA only takes one initial event into account
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