DFMEA – Severity ranking scale

A sample of a Severity ranking scale is shown here:

Severity Ranking

Ranking Description
1 The effect of the failure is of such a minor nature as to be undetectable by the customer. For example, the part may be out of
specification on a non-key quality characteristic but not have any noticeable effect on the system.
2-3 The failure’s effect is of a minor nature, although it is detectable by the customer, it causes only slight annoyance without any noticeable
degradation in the system performance.
4-6 The failure’s effect causes some customer dissatisfaction and some system degradation.
7-9 The failure’s effect causes major customer dissatisfaction and major system degradation. serious safety/legal implications.
10 Sudden, catastrophic failure without any prior warning. very serious legal implications.
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