Changes in the social and educational composition of public and private upper secondary schools in Île-de-France are taking place against a backdrop of profound changes to the rules governing the allocation of pupils to upper secondary schools. This transformation is the result of two distinct reforms:
a) the relaxation of school catchment areas in state lower and upper secondary schools, introduced at the start of the 2007 academic year;
b) the introduction, in the second half of the 2000s, of the automated allocation system Affelnet, which is used primarily to allocate pupils after Year 9.
Despite the significance of these institutional upheavals, very little quantitative data is currently available to accurately assess the impact of these reforms on the social and academic composition of upper secondary schools in the Île-de-France region.

