In Legality, Scott Shapiro introduces what he calls the “Planning Theory of Law.” Shapiro introduces the idea of a plan with examples from outside of the law. He then must provide an account of what is distinctive about law, such that the other plan-based social orders are not also legal systems. He gives two answers: first, a legal system is organized by a moral aim. Second, a legal system is self-certifying. I examine these in turn, and argue that each can only characterize what is distinctive about law if the relevant moral problem that law aims to solve is itself specifically concerned with authority—that is with who gets to decide about what. Other forms of planning assign roles to people to solve problems that have nothing to do with authority; law uses role-based authority to solve a moral problem that is fundamentally about authority.

Scott Shapiro offers an elaboration and defense of “legal positivism,” in which the official acceptance of a plan figures as the central explanatory notion. Rich in both ambition and insight, Legality casts an edifying new light on the structure of positive law and its officialdom. As a defense of positivism, however, it exhibits the odd feature that its main claims will prove quite acceptable to the natural lawyer. Perhaps this betokens – what many have begun to suspect anyway – that our usual tests for classifying legal theories (as positivist or not) are, in the present state of discussion, no longer credible. In any case, my hope in the following remarks is to suggest how certain ambiguities in Legality might easily be resolved in favor of Planning Natural Law. The Planning Theory of Law, in other words, is not proprietary to positivism.