Abstract
Everything that exists in nature competes without ceasing on its part, for a finality that makes its raison to be and ensures its continuity and that of its environment. The dynamic vision attached to the systemic thinking is a modern vision, because it is opposed to the static vision related to the analytical (classical) thinking! According to our research in the literatures on this subject, in 1637, René Descartes launched his ‘’Discourse on the Method’’ which was the model for many research works before systemic and system analysis in particular, and which is now a classic, as soon as the system analysis appeared in the XXth century, filled in the ‘’New Discourse on the Method’’ of the specialist in systemic and constructivist epistemology, Mr. Jean-Luis Le Moigne in his work ‘’The General System Theory : Modeling Theory’’. Each discourse has its paradigm as J.L Le Moigne said in 1977 in his ‘’New Discourse on the Method’’! The precepts of the new discourse on the method, as well as the characteristics of the open system paradigm as a new system paradigm defined by the systemic in general, have given after several historical processes the bankruptcy of the classic discourse of Descartes.