Affelnet-Lycée — France's National School-Placement Algorithm and Its 2025 Transparency Battle

Affelnet-Lycée is the algorithm France's Ministry of National Education has used nationwide since 2008 to assign students moving from collège to lycée (secondary school). It ranks each student's stated choices against catchment-area residence, academic results and social/scholarship criteria intended to promote mixité sociale, computing placements centrally each spring.

The system's stated aim is to allocate secondary-school places fairly at national scale while promoting social mix (mixité sociale) through its weighting of social and scholarship criteria.

In 2025 the system's transparency came under direct legal challenge in Paris: a 10 April 2025 circular from the Paris rectorat altered recruitment districts for several lycées without the joint decision from the Île-de-France regional council required under Article L.214-5 of the Education Code. Parents' associations sued in response.

On 7 May 2025 the Paris Administrative Court (case n° 2510774/1) suspended the circular in an emergency référé ruling, finding it caused serious and immediate harm to families during the active 5–26 May wish-submission window; the prior year's circular became applicable again pending a full-merits decision. A separate Senate question the same year raised complaints of 'incomprehensible, opaque and discretionary' placement decisions in the 8th arrondissement.

Affelnet-Lycée is as much a cautionary case as an administrative one: a nationally scaled, 15-year-old algorithmic placement system was found, by a court ruling and a Senate inquiry in the same year, to be insufficiently transparent and subject to real legal accountability gaps — it was independent judicial review, not the algorithm's own design, that caught the procedural failure.