Epistemological rupture an pedagogical constructivism in the work of Bachelard

Bachelard, considered as one of the fathers of the constructivism, is famous for its concept of "epistemological rupture". How an epistemology of the rupture can induce a constructivist pedagogy? This article shows that Bachelard defends at the same time the idea of epistemological discontinuity and that of psychopedagogic continuity. It also explains that there is not in Bachelard only one epistemological rupture, but two: on the one hand, between the common opinion and the science of the 19th century, on the other hand between those and the "new scientific spirit". What has important consequences in matter of school teaching of sciences.