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This article proposes to link two domains, projective clinic and clinic of the session. By presenting the device of a psychotherapeutic group of free play for young children suffering from pervasive developmental disorders, the authors will explain how the contribution of the analysis grids of the play processes developed from the Scéno-Test have refined their decryption of play in session and registers of psychic functioning in which these are inscribed. The clinical illustration will show how this finer analysis made it possible to decondense the intense projections of these children and thus contributed to the development of autistic mechanisms towards more conflicting registers of functioning.