The proposed model has been developed following traditional steps characterizing a typical AHP model, such as: in step 1 , the specific decision problem is structured; in step 2 , pair-wise com- parisons between criteria have to be carried out to obtain the judg- ment matrix. Local weights and subsequently, consistency of com- parisons have to be evaluated in step 3 ; subsequently, based on ag- gregation of local weights ( step 4 ), alternatives are finally ranked. Following each step is detailed.