Table 2.

Expert judgment term and fuzzy number transformation relationship.

Scale	Meaning	Triangular fuzzy number	Reciprocal
1	The two elements are equally important	(1,1,1)	(1,1,1)
2	Between equally important and slightly important	(1,2,3)	(1/3,1/2,1)
3	The former is slightly more important than the latter	(2,3,4)	(1/4,1/3,1/2)
4	Between slightly important and more important	(3,4,5)	(1/5,1/4,1/3)
5	The former is stronger and more important than the latter	(4,5,6)	(1/6,1/5,1/4)
6	Between strong importance and strong importance	(5,6,7)	(1/7,1/6,1/5)
7	The former is more important than the latter	(6,7,8)	(1/8,1/7,1/6)
8	Between strong importance and extreme importance	(7,8,9)	(1/9,1/8,1/7)
9	The former is more important than the latter	(8,9,9)	(1/9,1/9,1/8)