Thus, Bertalanffy claimed in the decade of 60 a new theory called General Theory the Systems, whose content is the formularization and derivation of the valid principles for ' ' sistemas' ' of general form. However, according to Chiavenato (2002), the general theory of the systems does not consist of the vacant search and superficial analogy. It obtains to move away itself from the logic of the physics, or the mathematics, to install itself in the heuristical logic. The proposal sistmica is capable to exceed to the exclusive problems of each science and to provide principles, is physicists, biological, psychological, sociological or general models for all involved sciences, in way that the discoveries effected in each science can be used by excessively. This theory demonstrates to the isomorphism of some sciences, making possible bigger approach between its borders and suppressing the empty spaces between the same ones. The systems cannot fully be understood only by separate and exclusive analysis of each one of its parts. Everything this is based on the understanding of the reciprocal dependence between disciplines them to all and on the necessity of its integration. The principles of the analytical thought, of the reducionistas and mechanist forms, are substituted by the opposing principles: exspansionism and the synthetic thought.
The said exspansionism that all the phenomenon is part of a bigger phenomenon. Thus being, the performance of a system depends on as it becomes related with its entorno of which it is part. What it really happens is a change of point of view, therefore the vision focada in the basic elements, present in the estruturalismo, is turned toward all. As example, the releitura of the law of the gravitation allowed, beyond an application to the apple of Newton, to find reasonable explanation in the planetary system, or the phenomenon of the tides. It does not import the size of the system that we evaluate, imports the degree of complexity and its representation in our investigations.