Due to the importance of clients satisfaction for companies and organizations in general, tools emerged to measure quality in the service and therefore, to know the level of satisfaction of the clients; as the SERVQUAL tool that was developed by Zeithaml, Parasuraman y Berry (1993), where the key factors are evaluated to measure the quality in the service offered. Figure 1 displays the client’s evaluation of quality service model in which SERVQUAL method is based. In this model it is established that the client expects a service (expectation) and assumes will receive it; conscious or unconsciously evaluates certain characteristics (service dimension) while receiving the service, what allows them to have an idea about it (perception) and evaluates it once is over. For this reason, SERVQUAL is one on the main information resources for companies to know clients’ satisfaction level, establish opportunities areas and propose and applies improvements to have satisfied clients. Client’s satisfaction is very important for all companies, reason why they have started to search for the way of improving in that aspect, offering a quality service to be in vanguard with other companies and to keep their clients.