The novel Harry POTTER reveals a generalised confusion on the society’s greatest institutions which stream ravages both individuals and society. It makes the confusion between the knowledge and discourses of various subject matters appear as an endogenous aspect of the identitary crisis. This is striking the school system and paralyses everyone. Answers are provided for giving a new lease to knowledge and life. Therefore, it provides to Harry Potter a major position among good educational novels.What ways can be found from individual contagion to pupil personal and professional identification ? Anthropological approach notions will only stress the literary text analysis, easily understandable even to the youngest.What ways can be found from discourses and subject matters contagion to the knowledge and the discourses of the various subject matters identification ?Interdidactical approach, from different and complementary theoretical reference, not only shows how the ordinary references are translated into fiction. It also allows creative rewritings provide both teachers and pupils with reflexive consciousness based upon the confrontation of practices, discourses and notions.