Table 5.

Linguistic variables for (a) criterion importance used for IVF-AHP comparison, and (b) performance of alternatives used for IVF-VIKOR comparison

(a)
Level of importance	Triangular IVF number
Equal importance	(1,1); 1; (1,1)
Moderate importance	(1,2); 3; (4,5)
Strong importance	(3,4); 5; (6,7)
Very strong importance	(5,6); 7; (8,9)
Extreme importance	(7,8); 9; (9,9)

(b)
Level of performance	Triangular IVF number
Very poor	(0.0); 0; (1,1.5)
Poor	(0.0.5); 1; (2.5,3.5)
Moderately poor	(0.1.5); 3; (4.5,5.5)
Fair	(2.5,3.5); 5; (6.5,7.5)
Moderately good	(4.5,5.5); 7; (8,9.5)
Good	(5.5,7.5); 9; (9.5,10)
Very good	(8.5,9.5); 10; (10.10)