Table 3: Linguistic scales for the importance.

Linguistic terms	Crisp Terms	Linguistic values
Very high influence	4	(0.5, 0.75, 1)
High influence	3	(0.25, 0.5, 0.75)
Low influence	2	(0, 0.25, 0.5)
Very low influence	1	(0, 0, 0.25)
No influence	0	(0, 0, 0)