Criticality Analysis

Criticality of a failure mode can be assessed using one of the following approaches:

1. Risk Priority Number

   The Risk Priority Number is the multiplication of O, S and D rankings (out of 10) to produce a numerical criticality ranking (out of 1000).

2. Fuzzy Criticality

   Uses Fuzzy Logic to combine Fuzzy rankings of O, S and D using a rule base instead of crisp multiplication.

3. Criticality Matrix / FAI

   Plots the criticality number of items or failure modes against the severity category of its end-effect. FAI interprets the criticality matrix by assigning a single numerical criticality ranking to every cell in the matrix.