Starting from an analysis of the article by Carlo Trigilia " Crescita squilibrata: perch�� la sociologia economica ha pi�� successo nella teoria che nelle pratiche? (Unbalanced growth: why is economic sociology more successful in theory than in practice?)", Published in 2007 in the journal Stato e Mercato, a theoretical-methodological proposal is developed, from a psychosociological perspective, for the development of an integrated approach of the social sciences to support the policy making processes in the context of socio-economic development policies. This proposal stems from a consideration on the important contribution to the critique of the individualist perspective in the field of psychological and social sciences, elaborated by Massimo Grasso and Sergio Salvatore in their 1997 book ���Pensiero e decisionalit��. Contributo alla critica della prospettiva individualista in psicologia (Thought and decision making. Contribution to the critique the individualist perspective in psychology", which shows in a clear and detailed manner the crucial importance of the unconscious dimension of social processes and more generally the role of symbolic-affective processes in the social construction of reality that underlies the processes of policy making, as strategies for solving problems of a collective nature.