Table 2.

Scale of relative importance (adapted from Saaty, 2008).

Relative importance	Definition	Description
1	Equal importance	Two indicators influence on objective equally
3	Moderate importance	Experience and judgement slightly favor one indicator over another
5	Strong importance	Experience and judgement strongly favor one indicator over another
7	Very strong importance	One decision indicator is favored strongly over another and its supremacy is established in practice
9	Extreme importance	The evidence favoring one decision indicator over another is of the highest possible order of validity
2, 4, 6, 8	Intermediate values between the two adjacent judgements	Compromise is needed