This article refers to the pedagogical experience called "Turmamais" and the essence of its organization. In terms of contextualization and theoretical and conceptual framework, it is based on a model which is centered in organizational factors such as class 'dimension' and 'compositional structure' as significative references of school achievement. The observed results prove significative falls in school repetition and dropout and an equally significative improvement in the quality of school levels among school cohorts of 3rd. cycle students, which, thus, tends to prove the project's efficacy. The criteria and procedure exploration and development for the measurement of results allow, on the other hand, to propose and deepen the debate over the adequacy and validation of the methodological instruments for the analysis of school development.
Turmamais; Class size; Class organizational structure; Educational effectiveness
