The procedural science has changed thanks to the paradigms of the right to access to justice (action). The purpose of this article is to study the defeat of the old paradigm of the action (of the procedural tendencies) for the new paradigm of the action in the new constitutionalism, for it is served the methodological sense of see the changes of the scientific knowledge as revolutions, which allows to determine that today the new paradigm of the science of the procedural law is that concept of action like a constitutional principle, which understands a new way of understanding the science of the procedural law, in a scene so called new constitutionalism and everything what it implies.