SUMMARY
This paper describes the changes in the demand and the transformations occurred in the Mental Health Center since its foundation in Italy. The paper analyzes the clinical and organizational problems intervened after the evolution of the demand, which can be read through diagnostic categories or as sign of emotional problems in the social coexistence milieau.Two areas of intervention take shape in the Mental Health Center:-illness the area of common emotional disorders;-the area of mental and complex cases. Two clinical cases are discussed, for each of the two corresponding areas, in order to analyze the emerging clinical and organizational problems and the different perspectives of intervention. The analysis of the clinical cases here proposed tries to point out that, unlike psychiatry and psychotherapy organized on dual settings, clinical psychology - as reference discipline for intervention in the dynamics between individual/coexistence environment/Service - can be more effective answer to the new challenges deriving from the ongoing transformations.