Aborda a teoria dos sistemas e a hermenêutica como duas correntes doutrinárias complexas, que abordam assuntos polêmicos envolvendo direito, filosofia e sociologia. O método de abordagem adotado será o dialético. Aponta noções introdutórias referentes ao papel do direito enquanto práxis social efetiva e não apenas dogmática. Conclui que nesta exposição procura-se buscar alternativas viáveis, além da simples idéia “melhor ou pior” doutrina, para que o direito adquira uma perspectiva de abertura, relacionada as demais áreas do conhecimento humano.; The systems theory and the hermeneutics come as two complex doctrinarian currents that approach controversial subjects involving right (the legal system), philosophy and sociology. In that way, considering the wideness of the theme, there is no intent or aim to drain the matter, but to point introductory notions regarding the paper of the right (the legal system) as effective social praxis, not merely dogmatic. Besides, with the presentation tries to look for viable alternatives, above and beyond the simple idea of "better or worse" doctrine, for the right (the legal system) to purchase an opening perspective, related the other areas of the human knowledge. The approach method adopted will be the dialectic, for the reason that, being the world an assemblage of processes is to take the science that is historical starting from yourinternal contradictions in a reciprocal action, taking into account the constants changes in the society.