“…Building up the concept of material implies several sciences and technologies in overlapping epistemological fields. The questions of transposition (Chevallard 1985(Chevallard , 1994Johsua, 1996) and appropriation associated with this concept at the primary school are a true challenge for the technology educator (Andre´ucci & Ginestie´, 2002;Ginestie´, 1999, The material concept is situated at the crosspoint of matter and object concepts. It is linked to the object production cycle, from extraction to products (Leroi-Gourhan, 1943, 1945, 1991Jacomy, 1990;Klaus-Henning, 1997;Haudricourt & Brunhes-Delamarre, 2000).…”