Franck Salles is Research fellow at the Department of Evaluation (DEPP) at the Ministry of Education. Responsible for mathematical contents at the student assessment office, specialist in international assessments (PISA, TIMSS) since 2010, national research coordinator (NRC) for eTIMSS 2019. Also a doctoral student in mathematics didactics at the Laboratory of Didactics André Revuz (LDAR) at Paris Diderot University.