Abstract
This work introduces the application of Cohen’s kappa concordance
coefficient as part of a comparative approach between different methods
used to improve the FMECA analysis. The proposed approach considers the
concordance assessment between different methodologies used in FMECA
(Risk Isosurface function, VIKOR, ITWH, FWGM, Type-I and Type-II Fuzzy
Inference System) when applied to the same problem and regarding an
FMECA ranking selected as the reference one. The analyzed problem is a
blood transfusion case study consisting of eleven failure modes widely
used for benchmarking. Results show that Type-II fuzzy inference systems
achieve the highest agreement regarding the reference FMECA ranking; one
possible explanation for this result is that Type-II FIS considers
uncertainty as an additional parameter. This approach proves effective
to compare statistically different FMECA methods instead of the
classical qualitative comparison between rankings.