People use speech to communicate, sharing information, knowledge, and stories, but the act of speaking and listening is no guarantee of a clear understanding. Schools are places where speaking and listening are primary methods of communication. In Brazil, it is a common practice to design a standard classroom and replicate it across the institution, be it public or private. In the presented study, the acoustical quality of standardized classrooms in two federal universities in Natal, Rio Grande do Norte, Brazil, was analyzed. The goal was to investigate acoustical similarities between standardized classrooms and to simulate solutions, proposing basic guidelines for classroom acoustics. Reverberation times were compared in similar rooms, defined according to some groups. The methodology consisted of an architectural survey, impulsive response measurements, and a comparison of results obtained in evaluated classrooms. The analyzed classrooms have poor acoustical quality regarding the intelligibility parameters. The best solution among simulated proposals depended on the shape and proportion of each classroom, varying between different percentages of absorbent material applied in the ceiling. An introduction to some research produced in Federal University of Rio Grande do Norte, Brazil, will also be presented.

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