The possibility and the ways of modifying behaviour patterns, by offering an individual an opportunity of interaction with a more or less structured situation, are a challenge for every form of psychotherapy. Different models have been formularized. Starting from the structural model of psycho-analysis, the ego-adaptative approach, the object relations theory and the interpersonal-evaluative system have been elaborated. The existential and client-centered model are based on the assumption that man disposes of innate potentialities, which have to be actualized. Therapeutic change consists in a liberation from impediments hampering this actualizing. In the methods of behaviour therapy favourable changes in behaviour are supposed to occur by learning-procedures of stimulus-response change, based on methods of conditioning. It is evident that the concepts, used in a given model of behaviour modification, will also have a repercussion in different attitudes towards and in the psychotherapeutic approach. Two topics are briefly discussed: the opportunities of evaluation of change and the task attributed to the therapist in the process of change.
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