Introduction
The doctrine of precedent, or stare decisis, is a fundamental characteristic of the common law system in England and Wales. In its simplest form, it means that like cases should be treated alike, and that a court is bound to follow the decisions of courts above it in the hierarchy. While this provides a basic, functional definition, the deeper ‘meaning’ of precedent is a more complex and contested subject within legal philosophy. It raises questions about the nature of law, the role of judges, and the balance between certainty and justice. This essay will explore the meaning of precedent by first outlining its formal, procedural dimension. It will then consider two prominent jurisprudential perspectives that offer different understandings of what judges are doing when they follow, or create, precedent. It will be argued that the meaning of precedent is not a single, settled concept, but rather a combination of formal rules and competing theoretical interpretations concerning judicial power and legal reasoning.
The Formal Doctrine of Precedent
The formal meaning of precedent is centred on a set of rules and conventions that govern judicial decision-making. The primary principle is that of binding precedent, which operates both vertically and horizontally within the court hierarchy. The Supreme Court binds all lower courts, the Court of Appeal binds the courts below it, and so on (McLeod, 2021). This hierarchical structure is essential for maintaining consistency and predictability in the law. Before 1966, the House of Lords (now the Supreme Court) was also bound by its own previous decisions, a rule established in London Street Tramways v London County Council [1898] AC 375. This was seen as a vital tool for ensuring certainty. However, this rigidity could also lead to injustice and prevent the law from developing. Recognising this, Lord Gardiner LC issued the Practice Statement (Judicial Precedent) [1966] 1 WLR 1234, which allows the Supreme Court to depart from its own previous decisions when it appears right to do so. This introduced an element of flexibility at the highest level, acknowledging that certainty is not the only value the law must serve.
Central to the operation of precedent is the distinction between the ratio decidendi and obiter dicta of a case. The ratio decidendi is the 'reason for the decision' and constitutes the binding element of the judgment. It is the legal principle that was necessary to resolve the issue before the court. Identifying the ratio is not always straightforward, as it must be extracted from the judgment, which may be long and complex. A classic example is the ratio in Donoghue v Stevenson [1932] AC 562, which established the ‘neighbour principle’ in negligence. By contrast, obiter dicta are 'things said by the way'. These are other legal arguments and statements in a judgment that are not essential to the final decision. While not binding, comments made obiter by senior judges can be highly persuasive and may form the basis of a future ratio decidendi (Slapper and Kelly, 2019). This formal framework provides the skeleton of precedent, suggesting a system where judges apply pre-existing rules found in past cases. However, this mechanical view does not fully capture the meaning of precedent, as it overlooks the interpretive choices judges must make.
Precedent as Rules and Discretion: A Positivist View
A deeper jurisprudential meaning of precedent can be understood through the lens of legal positivism, most famously articulated by H.L.A. Hart. For Hart, law is a system of primary rules (which govern conduct) and secondary rules (which manage the primary rules). The most important of these is the ‘rule of recognition’, which is the master rule that allows officials and citizens to identify valid law within a particular legal system (Hart, 2012). In the UK, the rule of recognition would include the principle that judicial precedents are a source of law. Under this view, when a judge follows a binding precedent, they are simply applying a valid rule of the system.
However, Hart acknowledged that this rule-following model is not complete. He argued that legal rules possess an ‘open texture’. Language is often imprecise, and rules cannot provide for every possible factual scenario. This creates a core of certainty where the rule clearly applies, and a ‘penumbra’ of doubt where it is unclear. In these ‘hard cases’, the law provides no determinate answer, and judges must exercise discretion to make new law. Hart saw this as a limited law-making (or legislative) function. When a judge is faced with a novel situation not clearly covered by an existing ratio, or when they must decide whether to extend a principle, they are effectively filling a gap in the law. For Hart (2012, p. 135), when a judge makes a new rule in this way, they are creating law rather than just discovering it. The meaning of precedent from this perspective is therefore twofold: it is a system of binding rules that provides certainty in most cases, but it is also a system that confers a delegated, interstitial legislative power on the judiciary to resolve uncertainty at the margins.
Precedent as Interpretation: Dworkin's Principled Approach
Ronald Dworkin offered a powerful critique of Hart’s model and, in doing so, proposed a different meaning for precedent. Dworkin objected to the idea that judges have strong discretion to act as part-time legislators in hard cases. He argued that this would be undemocratic and would amount to applying retroactive law (Dworkin, 1977). Instead, Dworkin contended that law is not just a system of rules, but also includes principles and policies. Principles are standards of justice or fairness, such as ‘no one should profit from their own wrong’. When a judge is faced with a hard case, they are not out of rules and free to decide as they wish. Instead, their task is to find the ‘one right answer’ which is already latent within the legal materials.
For Dworkin, precedent is part of a larger, seamless web of legal materials that a judge must interpret. The judge's role is to find the interpretation that best ‘fits’ and ‘justifies’ the legal practice of the community. ‘Fit’ requires the judge to respect past decisions and the existing legal landscape. ‘Justification’ requires the judge to interpret those materials in their best moral and political light, guided by the underlying principles of the system (Dworkin, 1986). Dworkin uses the analogy of a 'chain novel', where each judge is like an author who must write a new chapter. Each author must continue the story in a way that is consistent with what has been written before, but they must also try to make the novel the best it can be. In this view, precedent does not provide a fixed rule to be mechanically applied or abandoned at will. Rather, the "meaning" of precedent lies in its contribution to the ongoing narrative of the law. A previous case carries a "gravitational force" (Dworkin, 1977, p. 111) that pulls future decisions towards it, not as a binding command, but as a component of the institutional history that must be respected and coherently interpreted. Thus, for Dworkin, following precedent means engaging in a process of principled, constructive interpretation, rather than simply following rules or creating new ones.
Conclusion
In conclusion, the 'meaning of precedent' cannot be captured by a single definition. At its most basic level, it refers to the formal doctrine of stare decisis which provides structure and predictability to the common law system through its rules of hierarchy and binding ratio decidendi. This formal account, however, is incomplete. Jurisprudential analysis reveals deeper, contested meanings. For positivists like H.L.A. Hart, precedent is a system of rules that works well in clear cases but gives judges a necessary, discretionary law-making power in uncertain 'penumbral' areas. By contrast, for theorists like Ronald Dworkin, precedent is not about rules and discretion but about principled interpretation. It requires judges to treat past decisions as part of an institutional history that must be interpreted constructively to find the right answer, which is consistent with the underlying principles of justice that form the integrity of the legal system. Ultimately, the meaning of precedent is found in the tension between these views: it is both a stabilising force based on established rules and a dynamic process that allows for, and indeed requires, judicial interpretation and reasoning to shape the continuing development of the law.
References
Dworkin, R. (1977) Taking Rights Seriously. London: Duckworth.
Dworkin, R. (1986) Law's Empire. Cambridge, MA: Harvard University Press.
Hart, H.L.A. (2012) The Concept of Law. 3rd edn. Oxford: Oxford University Press.
McLeod, I. (2021) Legal Method. 11th edn. London: Red Globe Press.
Slapper, G. and Kelly, D. (2019) The English Legal System. 20th edn. Abingdon: Routledge.
Donoghue v Stevenson [1932] AC 562.
London Street Tramways v London County Council [1898] AC 375.
Practice Statement (Judicial Precedent) [1966] 1 WLR 1234.
