Event and fault trees

Event trees (ETs) describe system events and consequential failures. These are accident sequences. An ET is made up of a sequence of events constructed using deductive (forward) logic

Fault trees (FTs) describe ways in which a system involved in an accident can fail. An FT displays relationships among events leading to an undesireable event in an ET. FTs are developed using inductive (backward) logic

Fault trees

Decision trees

These are discussed in the section on evaluating risk

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