Descripción: “...In order to begin that intervention, they started from a call that was carried out through the Secretary of Education of Pereira, with the support of the Unit of Integral Attention UAI in the random selection within the schools of the urban area. 120 teachers from 12 public schools of Pereira were met between March and June, 2006. ; A survey was carried out to evaluate the knowledge about the strategies tending to the reduction of aggressive behaviors, by means of the application of instruments designed to that end. ...”