The debates about the interrelations between reason and law have undergone a change after the eighteenth century. References to the recta ratio of jusnaturalistic tradition have not disappeared, but other comprehensions of legal reason have developed. The European debate over legal positivist science has contributed to this in a manifestation of the rationality of law. This transformation may be considered the basis for the development of true “legal technologies” throughout the twentieth century. On the other hand, in the context of theories of positive law which have taken the relation between ethics and legal reason as a problem, the formation of discourses on coercion (Austin and Holmes), on validity (Kelsen and Hart) and on justificati...