ETA. Event tree analysis. Tree whose root is the event (anomaly, failure) considered (top event) and whose leaves are all its possible dangerous outcomes (Hazard). Bottom up technique to analyze the functioning of a system based on the succession of concatenated events. Method used in the analysis of the dangers deriving from the operation of a system (PHA, HA). Complementary to the FTA, FMEA and FMECA techniques
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