The Concept of Law

H.L.A. Hart's "The Concept of Law," first published in 1961, is a foundational work of twentieth-century legal philosophy. Hart, a professor of jurisprudence at Oxford, set out to answer what law actually is, and how it differs from mere commands backed by force, the position associated with John Austin. Hart argues that Austin's model of law as a sovereign's coercive order fails to explain its normative character—the way law claims authority and guides conduct, not merely compels it. Central to the book is the distinction between primary rules, which impose duties on conduct, and secondary rules, which govern how primary rules are made, changed, and adjudicated. Among the secondary rules, Hart identifies the rule of recognition as the ultimate criterion by which officials identify valid law in a given legal system. Where Austin relied on habit and coercion, Hart relies on social rules and an internal point of view—the perspective of those who accept rules as binding standards. He illustrates the inadequacy of a purely coercive account through the imagined case of the gunman who orders a bank clerk to hand over money; the clerk obeys from fear, not obligation, and Hart insists law is not simply this writ large. Hart also develops the open texture of law, arguing that general terms inevitably leave borderline cases for judicial discretion, and he criticizes both formalism, which denies such discretion, and American legal realism, which exaggerates it. In a famous chapter, he debates whether unjust laws remain law, engaging with the Radbruch thesis and the Nuremberg trials. A posthumous edition added a postscript responding to Ronald Dworkin's criticisms. The book remains the starting point for Anglo-American debates about legal positivism.