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Then, each decision-maker (DM) verbally expressed their preferences among the set of factor groups and factors by employing pairwise comparisons of the hierarchy elements at a given hierarchy level in relation to the elements in the higher level by using Saaty's importance scale (Table 4). Value 1 corresponds to the case in which two elements contribute in the same way to the element in the higher level. Value 9 corresponds to the case in which one of the two elements is significantly more important than the other. The results of the comparison are placed in comparison matrices.

Table 4

Saaty's importance scale

DefinitionAssigned value
Equally important 
Weak importance 
Strong importance 
Demonstrated importance 
Absolute importance 
Intermediate values 2, 4, 6, 8 
DefinitionAssigned value
Equally important 
Weak importance 
Strong importance 
Demonstrated importance 
Absolute importance 
Intermediate values 2, 4, 6, 8 

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