Table 2.

Significance scale of fuzzy judgment matrix and its meaning.

The serial number	Importance level	Uij assignment
1	i element, j element with equal importance	1
2	The i element is slightly more important than the j element.	3
3	The i element is obviously more important than the j element.	5
4	The i element is stronger than the j element.	7
5	The i element is extremely more important than the j element.	8
6	The i element is slightly less important than the j element.	1/3
7	The i element is obviously less important than the j element.	1/5
8	i element is strongly not important than j element.	1/7
9	Element i is extremely less important than element j.	1/9
10	Comparison of the importance of elements i and j between intermediate and adjacent judgment values (qualitative analysis to judge)	2, 4, 6, 8, 1/2, 1/4, 1/6, 1/8