Root Cause Analysis

Fault Tree Analysis (FTA)/Cause Map

Figure 6 : FTA Quick Facts

This method of RCA works by stating the undesirable result and looking into
contributing scenarios in a branched method. It is an expansion of the Five
Why method by adding branches to the initial ‘why’ tree. It works well in
systems in which faulty events can be linked to all possible contributing factors
such as equipment failures and design reviews. This method looks for actions
and conditions.

An example of this tool is shown below:

Figure 7 : Example of FTA

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