In all group therapeutic processes, there are interacting and interdependent mechanisms and changing conditions: the therapeutic factors (Corsini & Rosenberg, 1955; Yalom, 1995). These factors are intrinsic to the therapeutic process and unrelated to the type of group (Rorhbaugh & Bartels, 1975). The present study examines the factor structure of the questionnaire Factors Aspecific and Specific in the Group Therapy (FAT.A.S.-G.; Marogna, 2009), designed to investigate specific and non-specific therapeutic factors. The questionnaire was administered to 167 patients involved in a short-term psychotherapy group. The factor analysis identified two main dimensions: interdependence and the group as Object-Self. The Cronbach Alpha coefficients range from .88 to .93, showing high internal consistency between items
