Since the 1970s, schools have been characterized as loosely coupled systems, meaning that the teachers' work is weakly coordinated at the local level. Nonetheless, few studies have focused on the local variations of coordination modes, their sources and their nature. In this article, the process of local coordination of the teachers' work is analyzed, using a sociocognitive approach. A longitudinal study of the framing process conducted during two years in one school is presented, in order to capture the parallel evolution of the teachers' cognitive structures and the school's social structures. The results show that: (1) the framing process is at the heart of political games, meaning that the local definition of teaching and its conditions represent an important issue for the teachers; and that (2) the cognitive structures that emerge from the framing process appear to some extent to be decoupled from the teachers' actual practices, contributing only partially to the local process of the teachers' work coordination.