Six Sigma SPC's Quality Control Dictionary and Glossary
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RPN - Risk Priority Number

A six sigma tool that is a gauge used in a prevention plan in a FMEA, (Failure Mode and Effect Analysis) program. The RPN consists of three FMEA rating scales.

1. Severity
2. Occurrence
3. Detection

Also see DFSS, (Design for Six Sigma), area chart (per FMEA description), affinity chart or diagram, failure rate, loss function, parameter design, process design, and tolerance design.  

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