Judicial precedent is the foundation of common law systems. It ensures consistency, fairness, and predictability in legal decision-making — allowing individuals to understand and navigate the law with confidence.

What Is Judicial Precedent?

Judicial precedent, also known as case law, arises when judges decide how the law applies to a specific set of facts. While juries determine facts, only judges create precedent through their legal reasoning.

Once a court has ruled on how the law applies to a particular situation, future cases with similar facts are expected to follow that decision — a principle known as stare decisis (Latin for “to stand by things decided”).

Key Components of a Judgment

• Ratio Decidendi: The legal principle or reasoning that forms the basis of the decision. This is the binding part of the judgment and becomes precedent.
• Obiter Dicta: Comments made “by the way” — including hypothetical scenarios or broader reflections. These are not binding but may be persuasive in future cases.

How Judges Apply Precedent

When faced with a previous decision, judges may:

• Follow: Apply the same legal principle if the facts are sufficiently similar.
• Distinguish: Avoid applying the precedent if the facts differ significantly.
• Overrule: Declare a previous decision incorrect (only higher courts can do this).
• Reverse: Change the outcome of a lower court decision on appeal.

Why Precedent Matters

• Promotes legal certainty and equality before the law
• Prevents arbitrary interpretation by individual judges
• Encourages efficient legal practice by reducing unnecessary litigation

Caution Against Over-Citation

In R v Erskine (2009), the Court of Appeal warned against overwhelming the justice system with excessive case citations. Only cases that establish a legal principle should be cited — not those that merely illustrate or repeat it.