It´s necessary to submit an abstract for academic motivation for which has developed this thesis entitled: "The rationality and the scientific character of legal doctrine." The main motivation of the dissertation is to answer the question: Is legal doctrine a science? Or, in terms of scholar Ramírez Andrés Bernasconi, under what definition is the study of law a science? The answer to this question presents considerable complexity because they often mix two disciplines: 1) a conceptual thesis, which aims to provide a definition of law to a scientific approach, and 2) a methodological thesis, with which not only aware of what they do, therefore, what lawyers should do for accommodate a particular model of science. These two aspects (conception of law and legal science model) are often conceived as a duality, so that there is a relationship of interdependence that concrete that sometimes...