Event tree
Encyclopedia
Error tree is an inductive analytical diagram in which an event is analyzed using Boolean logic
Boolean logic
Boolean algebra is a logical calculus of truth values, developed by George Boole in the 1840s. It resembles the algebra of real numbers, but with the numeric operations of multiplication xy, addition x + y, and negation −x replaced by the respective logical operations of...

 to examine a chronological series of subsequent events or consequences. For example, event tree analysis is a major component of nuclear reactor safety engineering.

An event tree displays sequence progression, sequence end states and sequence-specific dependencies across time.

Analytical tool

Event tree analysis is a logical evaluative process which works by tracing forward in time or forwards through a causal chain to model risk. It does not require the premise of a known hazard. An event tree is a inductive investigatory process.

In contrast, the Fault Tree Analysis
Fault tree analysis
Fault tree analysis is a top down, deductive failure analysis in which an undesired state of a system is analyzed using boolean logic to combine a series of lower-level events...

 (FTA) evaluates risk by tracing backwards in time or backwards through a cause chain. The analysis takes as a premise a given hazard. FTA is a deductive investigatory process.

Applications

An event tree may start from a specific initiator such as loss of critical supply, or component failure.

Some industries use both fault trees and event trees. Software has been created for fault tree analysis and event tree analysis and is licensed for use at the world's nuclear power plants for Probabilistic Safety Assessment.

See also

  • Root cause analysis
    Root cause analysis
    Root cause analysis is a class of problem solving methods aimed at identifying the root causes of problems or events.Root Cause Analysis is any structured approach to identifying the factors that resulted in the nature, the magnitude, the location, and the timing of the harmful outcomes of one...

  • Ishikawa diagram
    Ishikawa diagram
    Ishikawa diagrams are causal diagrams that show the causes of a certain event -- created by Kaoru Ishikawa . Common uses of the Ishikawa diagram are product design and quality defect prevention, to identify potential factors causing an overall effect...

  • Why-Because analysis
    Why-Because analysis
    Why–because analysis is a method for accident analysis. It is independent of application domain and has been used to analyse, among others, aviation-, railway-, marine- and computer related accidents and incidents. It is mainly used as an after the fact analysis method...

  • Failure mode and effects analysis
    Failure mode and effects analysis
    A failure modes and effects analysis is a procedure in product development and operations management for analysis of potential failure modes within a system for classification by the severity and likelihood of the failures...

    (FMEA)
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