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Why should a judge today be bound by a decision made centuries ago? And when may that judge depart from it? These questions lie at the heart of precedent and common law reasoning. The common law tradition has long treated past judicial decisions as authoritative, yet the nature of that authority has been understood in radically different ways. The history of this subfield is a series of competing answers to the puzzle of how yesterday's ruling can constrain today's judgment without freezing the law into injustice.
For centuries, the dominant account was the Declaratory Theory of Precedent. According to this view, judges do not make law; they merely declare what the common law has always been. A precedent is evidence of the law, not a source of it. If a judge overrules a prior decision, the theory holds, the earlier ruling was simply mistaken—the true law was never what the earlier judge said it was. This framework preserved the fiction that law existed independently of human will, giving common law reasoning a quasi-sacred stability. Yet it struggled to explain why judges so often disagreed or why new circumstances required novel rulings.
Legal Positivism, beginning with John Austin in the 1830s and refined by H.L.A. Hart in the twentieth century, replaced the declaratory fiction with a more straightforward account. Law, for positivists, is a human-made social fact. Precedent is a source of law: when a court decides a case, it creates a rule that later courts are bound to follow, at least until a higher court overrules it. Hart's concept of a rule of recognition—the social rule that identifies which norms count as law—gave precedent a clear place. The positivist framework coexisted with the Declaratory Theory for a time, but it gradually absorbed the field by offering a more honest description of judicial lawmaking. Where the Declaratory Theory saw continuity, positivism saw a system of rules that judges themselves generate and modify.
Legal Realism, which flourished in the 1920s through the 1940s, attacked the very idea that rules—whether declared or posited—could determine outcomes. Realists like Karl Llewellyn and Jerome Frank argued that judges decide cases based on their personal backgrounds, policy preferences, or intuitive senses of justice, and only afterward rationalize those decisions with precedent. Precedent, on this view, does not constrain; it provides a repertoire of arguments that can be used to justify almost any result. The Realist challenge transformed the subfield by forcing every later framework to confront the gap between the rhetoric of precedent and the reality of judicial discretion.
The Legal Process School, developed by Henry Hart and Albert Sacks in the 1950s, responded directly to Realism's corrosive implications. Hart and Sacks accepted that mechanical rule-following is impossible, but they argued that courts can and should reason in a principled, institutional way. Precedent, for the Legal Process School, is not a straitjacket but a resource for reasoned elaboration. A judge should follow precedent unless there is a compelling reason to depart, and that reason must be articulated in terms of the purposes and principles underlying the legal system. This framework narrowed Realism's radical indeterminacy by insisting that judicial discretion can be disciplined by institutional roles and reasoned argument. It did not reject Realism's insights but sought to channel them into a constructive method.
Critical Legal Studies (CLS), emerging in the late 1970s, radicalized the Realist critique. CLS scholars argued that law is fundamentally indeterminate and that precedent is a tool of power, used to legitimize existing hierarchies. The common law's reliance on past decisions, they claimed, entrenches the status quo and masks political choices as neutral legal reasoning. CLS coexists with earlier frameworks as a permanent challenge: it denies that any method—whether positivist rule-following or process-oriented reasoning—can rescue precedent from its ideological character.
Feminist Legal Theory, which took shape around 1980, specialized the CLS critique by focusing on gender. Feminist scholars showed that precedent often embeds patriarchal assumptions—for example, in doctrines of contract, tort, or family law that treated women's experiences as marginal. The doctrine of stare decisis, they argued, can perpetuate exclusion unless judges are willing to reexamine the gendered foundations of past rulings. Feminist Legal Theory transformed the debate by insisting that the question "which precedent?" is as important as "why follow precedent?"
Critical Race Theory (CRT), crystallizing in the late 1980s, extended this critical method to race. CRT scholars demonstrated how precedent has been used to maintain racial subordination—from slavery cases to segregation to contemporary criminal justice. At the same time, they noted that precedent can occasionally be a resource for racial justice when earlier decisions contain principles that later courts can expand. CRT thus coexists with Feminist Legal Theory as a parallel critical project, each examining how precedent operates along a specific axis of power. Both frameworks remain active today, pressing the subfield to ask whose interests precedent serves.
Law as Integrity, developed by Ronald Dworkin in the 1980s, offered a constructive alternative to both positivism and the critical schools. Dworkin argued that judges should interpret precedent as part of a coherent set of principles that best justifies the legal system as a whole. This is not the declaratory theory's claim that law pre-exists; it is an interpretive claim that judges must construct the most morally attractive account of the community's legal practices. Law as Integrity revived the idea that precedent can be genuinely principled, but it did so by absorbing the critical insight that interpretation involves choice. It stands in contrast to Legal Positivism, which sees law as a system of rules, and to CLS, which sees law as politics. For Dworkin, precedent constrains because judges are bound by the requirement of coherence—they must fit past decisions while also showing them in their best light.
Today, no single framework dominates the subfield. Legal Positivism remains influential, especially in analytical jurisprudence, where scholars continue to debate how precedent fits into Hart's rule of recognition. Law as Integrity has shaped constitutional theory and debates about stare decisis in appellate courts. The critical schools—CLS, Feminist Legal Theory, and Critical Race Theory—continue to offer powerful critiques, particularly in legal education and interdisciplinary scholarship. These frameworks agree that precedent matters: even the most skeptical critic acknowledges that courts routinely invoke past decisions. But they disagree sharply on why it matters. Positivists see precedent as a source of law grounded in social practice; Dworkinians see it as part of a principled narrative; critical scholars see it as a site of ideological struggle. The central tension—between stability and flexibility, constraint and discretion—remains unresolved, and that is precisely what keeps the subfield alive.