An additional issue concerning the siting of solid waste facilities is the definition of new interface tools for the assignment of weights to the evaluation criteria used for selecting the best alternative among a list of potentially suitable sites (Demesouka et al., 2013 and Korucu and Erdagi, 2012). Such interface tools should be able to intercept the request for stakeholders’ involvement directly in the siting procedure in order to reduce to a minimum all those conditions that may negatively affect the outcome of a localization process (Llurdes et al., 2003).