The following paper will try to explain the difficulty based on the polisemic nature of the notion of complex systems and its broadly used in diverse disciplines such as: Physics, Biology, Sociology, Economics, and Social Psychology, and Clinic Psychology, due to the indetermination and the difficulty for its terminological use for the evaluation of social organizations, and other type of systems or webs, like natural systems, or animal, because this objects, are of different nature because of the language. [ABSTRACT FROM AUTHOR]