This study has as start-point the evidence of a crisis in authority models, which is related to several factors: transformations in society and in socialization means, institutional, organizational and pedagogic factors. This crisis has been affecting teacher’s work in many ways, requiring the creation of a new teaching profession, covering new competences and habilities, related to a predominant necessity of relational competence. In this context, the objective of this research is to think about some devices that can help to construct a legitimity and to establish the needed authority to teaching-learning process. It was considered essential the use of regulation strategies both in organizational and pedagogic ambits. These strategies were studied based on an ethnographic inspiration case study, performed in eighth and nineth grades of a private school for middle and popular students in Rio de Janeiro, during the first half of 2009. The methodology included observations, interviews and documental analisys. Key interlocutors to the research were authors as Dubet, with the concept of institutional programm declining; Tedesco and Fanfani, that bring the organizational dimension as an important device to consider different students’ demands; Leite and Postic, essentials to important classroom devices understanding, with contributions regarding to teacher-student comunicating and peer group influence, respectively.