“…The relative importance of criteria and subcriteria concerning the research objective are defined and ranked by Saaty scale of pairwise comparison. This scale consists of nine intensities of importance, five primary (1,3,5,7,9) and four intermediate (2,4,6,8). The meanings of each intensity of importance are 1 -equal importance, 2 -weak or slight, 3 -moderate importance, 4 -moderate plus, 5 -strong importance, 6 -strong plus, 7 -very strong or demonstrated importance, 8 -very, very strong, 9 -extreme importance.…”