This paper presents the results of a case study, in which the Semiotic Inspection Method (SIM) was applied to a transactional Web application of hotel reservations. The purpose of this assessment was to determine the degree in which the designers achieve to communicate the users their design intents through the system interface. This inspection, whose purpose was essentially academic, involved the participation of three students from the undergraduate program in Computer Engineering. The analysis of the different types of signs allowed to conclude that although there are some aspects that need to be improved, the level of communicability of this software is acceptable.