The theory change area have defined several operators trying to model the dynamic of knowledge. The goal of this work is to introduce a preprocessor of perceptions that could be part of an agent. The purpose of the preprocessor is to select an adequate change operator to store the perceptions that the agent perceives from the environment where their activities are performed. An agent receives perceptions, and classifies them according to how they were obtained by him/her. Once are the perceptions classified, the preprocessor selects one of the change operators to store the new information in the belief base. Then the preprocessor of perceptions sends the selected method and the perceptions to a change machine in the agent. When the change machine receives the mentioned inputs, it interacts with the belief base of the agent to store the new information.VIII Workshop de Agentes y Sistemas InteligentesRed de Universidades con Carreras en Informática (RedUNCI
