We look for tricks used to create a group of collaborative research which proposes to trainers of nurses researchers’ support in the appropriation of an original tool to help the learners analyze and develop their practice in vocational training : the narrative. The analysis of a corpus based on the first exchanges of the group shows the central role that plays the tool in itself, the mutual discovery of the cultures and the « habitus », the emergence and the discussion (...) of a generic definition of the job and its adjustment by the styles, the flexibility looked for in « scaffolding » and temporality. (shrink)