This work is a resume of a Research Project done at the Faculty of Humanities and Social Sciences of the National University of Misiones. It has been the MA thesis of the writer of this article to get his Postgraduate Degree in Master of Education at the Faculty of Philosophy and Human Sciences of the Catholic University “Nuestra Señora de la Asunción” (Paraguay). This study on school rituals, based on an socio-anthropology view, has arisen from the hypothesis of the anthropologist Roberto Da Matta. This hypothesis supports the theory that rituals are useful, specially in a complex society, to promote its social identity and develop its character. Da Matta says that it is as if the ritual domain were a privileged area from where to enter the cultural kernel of a society, its main ideology, its system of values. This is the reason why we have put forward the proposal that to enquire about rituals at schools can result in a useful contribution to analyse this institution in its reproductive dimension or in the construction of a determined social structure. This research was carried out in three schools of the city of Posadas, Misiones, Argentina. In two of them, a research was done based on a sustained, long-term and etnographic observation, students, parents, teachers and the managing staff were interviewed; in the other one, just the teachers and the managing staff were interviewed by means of a probing survey, in both cases, strategies, sources and techniques were combined.-