“…It was found in the literature a variety of studies that propose level of service evaluation based on an additive method (Barros, Somasundaraswaran & Wirasinghe, 2007;Correia, Wirasingue & Barros, 2008;Han, Ham, Yang & Baek, 2012;Lubbe, Douglas & Zambellis, 2011). The additive method assumes that the overall level of a service is composed of the sum of the level of service performance of all variables, taking into consideration their relative importance (weight).…”