Many child and adolescent psychotherapists are asked to work in specialized institutions (where the children are either interns or externs), with children presenting behaviour problems, learning difficulties, mental handicap or important psychosocial problems. They learn through diverse treatment forms, or parent accompaniment during the child's treatment (bifocal or conjoint treatment more or less regular therapeutic sessions with both parents and children, etc.). The treatment of children within an institution makes the treatment modalities and technique more complicated. The psychotherapist must have a perfect knowledge of the specific environment of the child, and keep in mind the desires and requests of the direction and the people who work directly with the child (teachers, specialized teachers, etc.). How can the problems brought up by the rivalry between the institution and the psychotherapist be canalized: length of therapy, merits (how did the pedagogical intervention help, recognition of a specific action or of work done in conjunction with the educative action)? If these facts are not recognized, the treatment will often be interrupted and the psychotherapist may be excluded from the institution. This will be avoided by ensuring further training of the therapist.