Lean Manufacturing and Six Sigma Definitions

Glossary terms, history, people and definitions about Lean and Six Sigma


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Acronym for Failure Modes and Effects Analysis. FMEA is a risk assessment tool, that evaluates the severity, occurrence and detection of risks to prioritize which ones are the most urgent. The two most popular types of FMEAs are Process (PFMEA) and Design (DFMEA).

Each category has a scoring matrix with a 1-10 scale.

  • Severity of 1 denotes low risk to the end customer, and a score of 10 denotes high risk to the customer.
  • Occurrence of 1 denotes low probability of the risk happening, and a 10 denotes a very high probability of the risk happening.
  • Detection of 1 denotes a process that WILL likely catch a failure, and a 10 means the process will likely NOT catch a failure.

Here are some sample scoring tables for your reference

After scoring of each category is complete for each risk, the three scores are multiplied together (Severity x Occurrence x Detection) to determine the Risk Priority Number (RPN). The RPNs are sorted from largest to smallest, and actions are taken on the top risks in order to reduce the overall risk.

Typically, the severity cannot be reduced, so the team should evaluate ways to reduce occurrence or increase detection. After actions are completed, the RPNs are recalculated and new risks are determined.

Download a FREE FMEA Excel Template which includes a sample scoring table >>>





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