Ronald Dworkin famously argued that legal positivism is a defective account of law because it has no account of Theoretical Disagreement. In this article I argue that legal positivism—as advanced by H.L.A. Hart—does not need an account of Theoretical Disagreement. Legal positivism does, however, need a plausible account of interpretation in law. I provide such an account in this article.

ABSTRACTConventionalism once seemed an attractive way to justify the viability of the positivistic social thesis. Subsequent criticism, however, has significantly lessened its attractiveness. This paper attempts to revive jurisprudential interest in conventionalism by claiming that positivists would profit more from the conventionalism of Ruth G. Millikan than that of David Lewis.Three arguments are proffered to support this contention. First, Millikan's conventionalism is not vulnerable to the major criticism leveled at conventionalism, viz its compliance-dependence, as this is not its defining feature. (...) Second, Millikanian conventionalism retains conventionalism's ability to explain how law emerges from social practices while avoiding the main disadvantage of Lewisian conventionalism, viz its inability to explain the normativity and contestability of law. Third, Millikan's conventionalism can more effectively repel Dworkin's and Greenberg's assaults on legal positivism than its Lewisian counterpart.To the memory of Maurice O'Brien. (shrink)

Scott Shapiro’s Legality argues the positivist Planning Theory of law meets the anti-positivist challenge posed by the argument from theoretical disagreements about law in Ronald Dworkin’s Law’s Empire. Legality equates theoretical disagreements with what Shapiro calls meta-interpretive disagreements, and then offers a legal theory of meta-interpretation that purportedly accounts for the existence of meta-interpretive disagreements by showing how it is rational or intelligible for legal actors to have such disagreements. This paper argues Legality misconstrues Law’s Empire. The true challenge of (...) ATD was to provide a theory of law that would vindicate the judgment that law is discovered in cases of theoretical disagreements, rather than made. Legality sees the challenge of Law’s Empire to be to show how it is rational or intelligible for legal actors to have theoretical disagreements, which is different from showing how there really is pre-existing law to be found in cases of theoretical disagreements. So the challenge Legality addresses is circumscribed. But Legality does not even succeed at addressing its own more circumscribed challenge, because, under the Planning Theory of meta-interpretation, legal actors are mistaken to think they are finding law in cases of theoretical disagreements. (shrink)