When processes cycle infrequently, the FMEA, RPN and conversion to Process Sigma level provide the means to quantify the improvement. FMEA (failure modes and effects analysis) is a powerful tool for identifying, defining and quantifying root causes to operations issues. The RPN quantifies the impact of a potential root cause providing the means to rank the root causes. Converting the RPN into a Process Sigma Level is shown in a handy table.

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