"Population and Housing Census" and "Population and housing census. Education" are some exhaustive sources of information on the education level of the population; they offer an accurate snapshot allowing, at the same time, an analysis by strata difficult for a survey. This is the case of the population who, without being necessarily students, studied Vocational and Complementary Training. The series of rates of the population with secondary studies by age stratum and sex come from the conjunctural operation Survey on the Population in Relation to Activity (PRA) and constitutes a structural indicator with a high degree of comparability in the European statistics framework.