“…Regarding the complexity of the phenomena that occur in intra-and interpsychic groups, it is difficult to identify an absolute hierarchy of therapeutic aspects and, for this reason, the therapeutic factors are differentiated on the basis of different dimensions such as the state of patient regression, the conducting procedures, and the length and the development stage of the group (Butler & Fuhriman, 1983;Roy, Turcotte, Montminy, & Lindsay, 2005;Yalom, 1975). The only existing hierarchy was made by Parloff and colleagues (1988) who attempted to categorize non-specific and specific factors: the first are not related to a theoretical model or the specific technique used by the therapist and the second, conversely, are related to a specific therapeutic model and strategies derived from it (Parloff, 1988).…”