“…Unfortunately, the separate collection process lacks fixed rules and varies according to the characteristics of the local territory. The toughest difficulties arise in mountain areas (Lebersorger et al, 2011;Weissenbacher et al, 2008aWeissenbacher et al, , 2008bWett et al, 2002aWett et al, , 2002b. In particular, the activation of a separate collection process in mountain areas requires to consider a number of constraints: altitude, natural conditions, dispersion and dwelling isolation, tourist presence, type of waste produced, distance from collection points and traffic route conditions (Comunità Europee, 2000).…”