The classical conception of rationality is that which holds that there is only one way to be rational, namely the acceptance of certain methodological rules that offer us necessary and universal results. This position adopted and developed a method of justification based on the algorithmic model offered by logic and mathematics and developed a normative model which, in principle, shares the desideratum that the results of an evaluation process are also of a necessary and universal character in the precise sense that all those individuals who apply the rules must necessarily reach the same conclusions.