Event Tree Analysis (ETA)

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Event Tree Analysis is one of the most widely used methods in system risk analysis. It is an inductive failure analysis performed to determine the consequences of a single failure for the overall system risk or reliability. Event Tree Analysis uses similar logic and mathematics as Fault Tree Analysis, but the approach is different - FTA uses a deductive approach (from a system failure to its causes), while ETA uses an inductive approach (from a basic failure to its consequences).

An event tree itself is a visual representation of single failure sequences, together with a single failure impact on other events and on the whole system.

Event Tree Analysis Example
Main window of the RAM Commander's Event Tree Analysis Module

ETA Module Features
•  User-friendly and convenient tree building interface (zoom, export to clipboard as metafile, print, etc.)
•  Customizable graphical representation (colors of diagram elements, their styles, etc.)
•  Events Library
•  Event Probability assessment models:
   o user-defined
   o calculated (repairable/unrepairable/constant mission time/periodical tests)
   o linked to product tree element
   o linked to FMECA Failure Mode, NHE or End Effect
   o linked to Fault Tree basic event
   o linked to Fault Tree gate or tree top event
•  Different Event logic types:
   o Binary logic 
            - True/False 
            - Success/Failure
   o Multiple alternatives (for events where not only True/False or Success/Failure outcomes are considered)
•  Different Event probability types
   o Equal event probabilities in all sequences
   o Different event probabilities in different sequences (conditional probabilities)

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See also:

RAM Commander homepage
Fault Tree Analysis Software Module
ALD Reliability and Safety Software Overview
Reliability&Safety Software Download
See ALD Reliability, Safety and Quality Services if you wish us to perform reliability prediction, analysis or other services for you.