This research had as its objective to analyze what are the adaptations that are taking place in the organization of teaching practices in a school with good academic results (as indicated by current national assessments), since changes were deployed by the curriculum policies of the Municipal Secretary of Education of Rio de Janeiro (SME/RJ). We especially investigated how teachers are interpreting such changes in the school context and their perceptions regarding the effects of these initiatives. As a theoretical-methodological framework, we choose the Policy Cycle Approach, developed by Stephen Ball and his colleagues (1994), to understand the process of formulating the new curriculum guidelines of the SME / RJ from the context in which it is inserted. The research had a qualitative approach, using a direct observation in classroom and educational school meetings, besides that, we used interviews and questionnaires with teachers and the school management team. In general, the implemented changes in policies emphasize a performance practice. Furthermore, among the research key findings, we found an acceptance of the establishment of a unified curriculum, little resistance to the proposed policy methodology and a reconceptualization of the implemented strategies, based on the teachers’ conceptions and views about education and the pedagogical approach from which they built their teaching experience.