How financial institutions do they manage their interface with their decision-making context? What is the performance "social" beyond the simple economic and financial performance? How can we measure this performance "social"? This article focuses on the theoretical corpus contemporary necessary to understand the couple context decision / financial institutions. This is basically to contribute to the establishment of a comprehensive approach which captures applied with consistency, the conceptual opposition series (role and impact) of the decision context / financial institutions structures. Gradually, driven by the reality of change, the paper come to a Copernican revolution in the theory of relations between financial institutions and decision context. Standards for new perspectives on the role of the financial institutions, it is not the decision-making environment that revolves around the sun institutions. Note that this reversal was anticipated in 1965 by Emery and Trist in a prophetic article, but it is only recently that we began to theorize in this direction. The article finally understood that economic performance is insufficient to ensure the sustainability of the organisations, at least for him to avoid problems. We understand that in a multiple rationalities world, the issue of "social performance of the financial institutions" is wide open to uncertainty. Everything depends on the status that is given to the organization: simple machine to produce cash register for shareholders, human community service of another larger community?