In therapeutic preliminary talks, the therapist and the adolescent person (the potential patient) are together trying to answer the question of the indication. This is why every preliminary talk is designed like a "trial therapeutical session". The study tries to answer the question of the cognitive organization of the verbalization from a sozio-scientific point of view. A sociological-interpretative approach was chosen to analyse transcripts of recordings of 30 of such therapeutic preliminary sessions, which provide the foundation for the study. The sociological-interpretative method allows it to filter out several phenomenons of verbal interaction, as for example when there is an incongruity of the different perceptions of "everyday life" and "therapy". A speech-style model is used to evaluate the formal result of the indication (as well as of the therapy).