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This article is based upon the observations, carried out within a didactic engineering framework (Adjiage & Rauscher, 2013), on the procedure of solving a modeling problem by 10-11 year-old students. Here we return to this engineering using the MWS framework (Kuzniak, 2011). This allows us to reinterpret certain phenomena, as well as to imagine more means to improve our system. Thus, we analyze the failure of certain students to succeed in terms of the empiric and theoretic referential deficit in their own personal MWS; infer evolution possibilities of the suitable MWS; interpret mental blockages in terms of dissociation of visual and experimental genesis; finally, analyze progresses in terms of capacity to integrate these two genesis through a written practice of the written (Duval, 2001).
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