The AHP framework provides a comprehensive and rational methodology, which encompasses the following steps: (1) structuring a decision problem in a hierarchy, (2) obtaining the judgment matrix based on pair-wise comparisons between alternatives and between criteria, (3) testing consistency until satisfactory, and (4) synthesizing comparisons across various levels to obtain the final weights of alternatives. Users of AHP make judgments on pair-wise comparisons according to Saaty's discrete 9- value scale method. The matrix is called a pair-wise weighting matrix (PWM) [7].