In the Middle Neolithic of the Paris Basin, the opposition between Chasséen groups (Chasséen septentrional and Chasséen de Bourgogne) and Michelsberg is particularly well expressed through arrowheads : dominance of transverse arrowheads for the former and pointed arrowheads for the latter. These arrowheads are examined in terms of technology and typology, thus improving our knowledge of chronological relations between groups, as well as processes dividing the region during the Middle Neolithic. Through the technological approach, characteristic debitage methods are described and these are just as variable and relevant as purely typological attributes.  A method scpecific to early Michelsberg has thus been identified, in particular on a corpus of so-called leaf-shaped arrowheads whose characteristics have never been successfully described through typology alone.