Fault Tree Analysis

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The fault tree analysis is a top-down method used to analyze failures.  It uses Boolean logic to combine a sequence of lower-level occurrences.  In many cases a fault tree is used to analyze the reliability, maintainability and safety of a system.

The analysis typically begins with a generic idea similar to the way a fishbone diagram starts.  Once this generic idea, issue or failure is captured the tools users begin building their fault tree.  The branches attempt to determine different causes of the initial conclusion, idea, issue or failure by building out a "logic" or "logical" branches which take the shape of a fault tree.  The fault tree is made up of logic symbols, such as “or” and “and” gates. 

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