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In this paper, we analyze an aid session tested by an elementary schoolteachers. This aid session has been set up by a teacher for some students withdifficulties after the work in the whole class. We first show how this aidsession can help the pupils, especially through its chrono-topo-meso-geneticfunctions. Then we analyze a second situation in which the aid session isimplemented, looking for clues of these functions in some episodes involvingstudents who participated in the aid session.

Etude d'un dispositif d'aide a l'intention d'{\'e}l{\`e}ves en difficult{\'e} dans la r{\'e}solution d'une situation-probl{\`e}me math{\'e}matique