Let’s start with the basic concept, the notion of system itself. There were andstillarecountlessdefinitionsof“system”.Wedonotlistthemhereortryacom-prehensive categorization of those notions. For our purpose at this point, weonly need reflect on what a system is.That is the question: what is a system?The first answer that may come to our minds is a unit.When something iscalled a system,the notion of unit is immediately conveyed; a unit with collec-tions of elements inside; a sort of a set in mathematic terms, whose elementshave relations among themselves.With this notion comes the corollary idea of limits and, with that, the ab-stract image of internal and external difference,in whatever conceptual spacewemayprojectit.Thus,somethingbelongstothesystemwhilesomethingelsedoesn’t. The opposition can be characterized as a distinction between systemandenvironment.Somethingsbelongtothesystemandeverythingelsetotheenvironment,including other systems that may exist there.