Rules versus Principles

Think of the selectors picking a cricket team. One standard binds them absolutely: a player not registered with the board cannot be picked, however brilliant. It either applies or it does not. Other standards pull in different directions: pick players in form, give young talent a chance, keep a balance of batting and bowling. The selectors weigh them, and a consideration that loses today, say youth, is not abolished; it may win next month. The first kind is a rule; the second kind are principles. Dworkin's claim was that law, like team selection, uses both, and that a theory which sees only rules misdescribes the law. His theory as a whole is in Note 19 and the debate with Hart in Note 64; this note isolates the distinction itself.

1. The Distinction and Its Purpose

Hart pictured law as a system of rules identified by a rule of recognition that looks to their source or pedigree (Note 11). Dworkin, in 'The Model of Rules' (1967), argued that when lawyers argue hard cases they rely on standards that are not rules: principles, and sometimes policies. If principles are law and yet cannot be identified by pedigree, the rule of recognition cannot capture the whole of law, and Hart's picture of discretion in hard cases (Note 47) also fails. The distinction was thus the first step in an attack on positivism, not classification for its own sake.

2. Rules: The All-or-Nothing Mode

A rule, on Dworkin's account, is applicable in an all-or-nothing fashion. If the facts it stipulates are given, then either the rule is valid, in which case the answer it supplies must be accepted, or it is not, in which case it contributes nothing to the decision. His illustration was a rule of a game: in baseball a batter who has had three strikes is out. An official cannot accept that rule and yet decide that such a batter is not out. A rule may have exceptions, but a complete statement of the rule would include them.

It follows that a conflict between rules cannot be resolved by weighing. If two rules require incompatible results, one of them must be invalid, or one must be read as an exception to the other. Further rules decide which: the later enactment prevails over the earlier, the special over the general, the higher over the lower.

3. Principles: The Dimension of Weight

A principle works differently. It states a reason that argues in one direction but does not necessitate a particular decision. The principle that no one may profit from his own wrong does not mean that no one ever does: a trespasser who walks across land long enough may acquire a right of way, and a man who breaks a contract to take a better-paid job may keep his new salary. These are not exceptions a fuller statement could list; the principle is simply one consideration among others.

Principles therefore have a dimension of weight or importance which rules lack. When principles intersect, the judge must take into account the relative weight of each, and the principle that loses is not invalidated: it remains part of the law and may prevail in the next case. Dworkin added an observation that links this note to Note 110: words such as 'reasonable', 'negligent', 'unjust' and 'significant' make a rule's application depend in part on principles and policies lying beyond the rule, and so make the rule more like a principle, though without quite turning it into one.

Dworkin further separated principles, which describe individual rights, from policies, which set out collective goals; courts should decide hard cases on principle, leaving policy to the legislature (Note 19).

4. No Pedigree Test for Principles

Why can the rule of recognition not identify principles? Because, Dworkin argued, a legal principle originates not in a particular decision of a legislature or court but in a sense of appropriateness developed in the profession and the public over time. Its institutional support can be pointed to, but no formula says how much support makes a principle law, or fixes its weight. Even a court's power to change a rule, he added, is governed by principles: it may do so only when a principle favouring change outweighs principles such as deference to the legislature and respect for precedent.

5. The Replies: Hart and Raz

Hart's Postscript (published posthumously, 1994) answered in two ways. First, principles can be law under a rule of recognition: many are identified by pedigree, being repeatedly cited in cases, and a rule of recognition may itself make conformity with moral principles a test of validity. This is inclusive or soft positivism (Note 64). Second, Hart denied that the contrast is as sharp as Dworkin claimed. In Riggs itself a valid rule gave way to a principle, which is hard to square with the idea that rules always apply all-or-nothing. On Hart's view principles differ from rules chiefly in degree: they are broader and less specific, refer more or less explicitly to some purpose or value, and are not conclusive.

Joseph Raz, in 'Legal Principles and the Limits of Law' (1972), made a related criticism: rules too may conflict without either being invalid, and the real difference lies mainly in generality, rules prescribing relatively specific acts and principles highly unspecific ones. Principles, on this view, lie at one end of a spectrum rather than forming a separate logical species.

6. Alexy: Principles as Optimisation Requirements

The German theorist Robert Alexy, in A Theory of Constitutional Rights (German original 1985; English translation 2002), accepted a sharp distinction and gave it a new form. Rules are definitive commands: they are either fulfilled or not. Principles are optimisation requirements: they demand that something be realised to the greatest extent possible, relative to what is legally and factually possible. A conflict of rules is resolved by an exception or a declaration of invalidity; a collision of principles is resolved by deciding which principle takes precedence under the conditions of the case, leaving the other valid.

Alexy linked this to proportionality. Its three sub-principles, suitability, necessity and proportionality in the narrow sense (balancing), follow from the nature of principles as optimisation requirements. His law of balancing states that the greater the degree of non-satisfaction of, or detriment to, one principle, the greater must be the importance of satisfying the other.

7. The Indian Perspective

Indian law shows principles enacted as rules, principles recognised without an enacted source, and principles weighed through proportionality. The cases illustrate the theory; they do not apply it by name.

8. The Two Compared

9. Evaluation

Dworkin's distinction permanently changed legal theory: positivists after him had to explain principles, whether by admitting them through the rule of recognition (Hart) or by denying that they are law in their own right (Raz). The strongest criticism is that the line is less clean than Dworkin drew it: rules sometimes yield, and principles harden into rules, as Section 25 shows. Alexy's version has been the most influential in constitutional courts, India's included, because it turns weighing into a structured method. The safe exam position is that the distinction usefully describes how standards function in reasoning, whatever its force against positivism.

10. Frequently Asked Questions

Q. What is the difference between rules and principles?
A. On Dworkin's account, rules apply in an all-or-nothing way: if a valid rule applies, it decides the case, and conflicting rules cannot both be valid. Principles have weight: they give reasons pointing one way, are balanced against other principles, and survive when outweighed.

Q. Why did Dworkin think principles defeat Hart's positivism?
A. Because principles are part of the law, yet their authority comes from a sense of appropriateness developed over time rather than from a source a rule of recognition could test. If law includes standards that no pedigree test identifies, the rule of recognition cannot capture the whole of law.

Q. How did Hart respond?
A. In the Postscript (1994) he said many principles can be identified by pedigree, that a rule of recognition may include moral principles as criteria of validity, and that rules and principles differ only in degree, since in Riggs a valid rule was itself outweighed by a principle.

See also: Note 19 (Dworkin), Note 64 (Hart versus Dworkin), Note 110 (rules versus standards), Note 47 (certainty and discretion), Note 11 (analytical positivism).