Usability, prototyping and user profile have been subjects of a variety of researches related to the human-computer interface. Usability considers aspects as effectiveness, efficiency and satisfaction of the user concerning to the interaction between the user and the system. Contemplating this topic, a case study will be present, which will expose a proposal of a new model of interface for a specific system that is already in use. This case study deals with aspects related to user, whose is composed basically for people from the countryside of Brazil without much familiarity with the computers. The evolution of proposal and the comments obtained from the representative of the user will be explained, as well as the reasons of the changes during the gradual development of the proposal and the advantages of the final version. The results reached through this article suggest that using prototypes focusing the user profile is extremely important for the success and approval of the system by the user.
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