The commentary focuses on chapter IV of Positivismo jurídico «interno» by María Cristina Redondo. It offers a reformulation of the interpretive thesis that the author exposes and criticizes, and it answers the criticisms of Fernando Atria's La forma del Derecho from an «institutionalist» point of view. Finally, it shows the advantages of adopting such a theoretical position to broaden the scope of legal theory towards special theories of law.