This paper is part of doctoral research that bears the title Research at Faculties of Education in Bogotá: Social Representations of Teachers. Its aim is to establish a connection between theories of social representations and didactic based on the concept of dialogue of knowledge. Therefore, discussions are proposed about knowledge as core generator of didactical debate and as common ground between science and common sense, but at the same time as the foundation of the concept of social representations developed by the school of Serge Moscovici.