Table III Comparison of risk evaluation...

Table III

Comparison of risk evaluation methods

Method	Risk aggregation protocol	Warning system	W1	W2	W3	Failure effects
FMEA	$({O, S, D}, 1, \prod)$	W2	n/a	0	n/a	0
Fuzzy FMEA	${τ (O), τ (S), τ (D), 1, \prod}$	W2	n/a	0	n/a	0
TREF	({O,S,D,C,I,R},1, $S_{1}$ ⁠)	W1–W3	6	3	1	5
TREF	({O,S,D,C,I,R}, $W_{Q}^{(0)}$ ⁠, $S_{1}$ ⁠)	W1–W3	6	0	1	5
TREF	({O,S,D,C,I,R}, $W_{Q}^{(0)}$ ⁠, $S_{3}$ ⁠)	W1–W3	6	2	1	7
TREF	({O,S,D,C,I,R}, $W_{Q}^{(0)}$ ⁠, $S_{4}$ ⁠)	W1–W3	6	3	1	5

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