In Critical Introduction to Natural Right, presented here in its second English edition, Javier Hervada proposes what he labels as "classical juridical realism," which considers the notion of right as that which is just to be the focal point of the juridical domain. Written for didactic purposes, this short book is highly original. In fact, it represents a decisive turning point in Hervada's intellectual itinerary and therefore remains a foundational text for the whole of his juridical thought.