**Author details**

**Severity Occurrence Detection New RPN**

**Initial** 3 8 7 168 **Revised** 5 8 3 120 Multicriteria RPN = % reduction in RPN = (RPN initial—RPN revised)/RPN initial 29 %

160 Applications and Theory of Analytic Hierarchy Process - Decision Making for Strategic Decisions

**Figure 11** shows a comparison between initial and revised RPNs, highlighting the *RPN reduction* for each FM. It is significant to point out that in general **Figure 11** shows, for the specific case study, a reduction of the RPN because usually the expert team have overestimated

Of course, in our opinion, the above assessment allows to evaluate the RPN more precisely

This paper proposes a novel approach to prioritize failure modes taking into account human errors. The final aim was to improve the evaluation of risk priority number integrating human errors in the calculation. The goal was achieved through a multicriteria model, based on AHP. The method allowed us to weigh the failure modes integrating with human errors and to prioritize failure modes. The model can be applied when there is a disagreement in ranking scale for severity, occurrence, and detection. The novelty of the method is because there is no evidence in literature of this kind of approach using AHP. In our opinion, the proposed method

**Table 12.** Example of calculation of RPN.

one parameter. But an *increase of RPN* could happen also.

**Figure 11.** Comparison between initial and revised RPN.

**5. Conclusion**

and objectively with respect to the traditional approach.

Fabio De Felice1 , Antonella Petrillo2\* and Domenico Falcone3

