This project aims to observe and analyze the way the current national program of complementary activities in primary school is being developed in five schools, considered positive examples, among the different actors involved (education regional offices, local authorities, teachers, students and families). The main purpose is to find out key-factors for the success in this program management. The knowledge about the central factors in these schools is important to identify procedures able to be transposed to other schools and, in broader terms, for the next policies in this domain.