Theatre of the Oppressed (TO) is an aesthetic alphabetisation method, organized by Augusto Boal, which aims at promoting social change and humanization through dialog and aesthetic means. This work analyses dialogs place inside TO. The first part presents an analysis of some researches about TO, seeking to reveal how they place dialog inside TO. The second part analyse the work of Augusto Boal presenting the historical development of TO pedagogic dimension and reveals the influences of the historical process. Boal texts were analysed as historical documents in the perspective of Cultural Materialism. This analysis reveals that TO dialog perspective, on the opposite way of the analysed works, is based in two pillars: Pedagogy of the Oppressed and Socratic Method. These two perspectives are investigated in order to define the limits between theirs original conceptions and Boal own interpretation. The last part presents the Cento de Teatro do Oprimido (CTO) jokers thought about dialog inside TO, through the analyses of interviews. It then concludes that the Socratic perspective, as used by Boal and CTO, set some limits in order to reach their objectives, producing a new dialogical perspective. Nevertheless, CTO effort to investigate and build a ever more dialogical and faithful to its origins and Boal thoughts, as well as able to deal with the new demands of nowadays.