The concept of democratization of thr school system has not received thorou
gh intellectual scrutiny considering the social and especially political im
portance that is attached to the notion. particularly in France. The terms
currently used to define the modalities of democratization are in effect pa
rtial. This article sets out to show that democratization of the school sys
tem can he analyzed by applying three modalities, qualified as much less th
an equalizing much greater than, much less than uniform much greater than a
nd much less than segregative much greater than. The typology thus defined
is then applied in a study of the teaching of the first educational cycle a
t the national level and of second educational cycle in the Academy (educat
ion region) of Rennes. Depending on the variables and cycles selected, the
author concluder for a uniform or segregative democratization of the school
system during thr period under review.