From here, weights for criteria and alternatives can be obtained following different methods, like the arithmetic mean, the eigenvalue approach proposed by Saaty (1980) or the geometric mean (Ishizaka and Lusti, 2006). The method developed by Saaty computes and aggregates the eigenvectors until the composite final vector of weight coefficients for alternatives is obtained. The entries of final weight coefficients vector reflect the relative importance (value) of each alternative with respect to the goal stated at the top of hierarchy. Weights were normalized to make them range between 0 and 1.