The historical development of the Didactic Transposition concept in curricular project of disciplinary knowledges

The didactic transposition transform disciplinary contents to define the curricula of the corresponding disciplines "of school", through a process with a sequence of almost linear knowledges logically and epistemologically organized in the written text of the programs and textbooks. In this paper, after analyzing the concept from the point of view of the Chevellard’s studies conducted about it, the author who first coined the term, we focus on the developments that the didactic transposition had in Italy in recent years.