Table 2.

Verbal definition of triangular fuzzy numbers for the weight of risk items [9].

Qualitative Descriptors of Severity	explanations	triangular fuzzy numbers
Equal importance	Two experts or attributes contribute equally to the event	(1,1,2)
Weak importance	Experience and judgment slightly favor an expert or attribute over another	(2,3,4)
Strong importance	Experience and judgment strongly favor an expert or attribute over another	(4,5,6)
Very strong importance	An expert or attribute is favored strongly over another	(6,7,8)
absolute importance	The evidence favoring expert or attribute over another is of the highest order of affirmation	(8,9,9)