Ratio Decidendi

Ratio decidendi refers to the legal principle or rule that constitutes the basis for a court's decision. It is the binding element of a judicial decision that establishes precedent for future cases.

The term 'ratio decidendi' originates from Latin, which means 'the reason for the decision.' It has been a foundational aspect of common law systems since the early development of judicial precedents.

In modern law, ratio decidendi plays a crucial role in ensuring consistency and predictability in judicial decision-making. Courts rely on the ratio of earlier cases to guide their rulings, making it essential for lawyers and judges to identify and articulate the ratio decidendi clearly.

• In Donoghue v. Stevenson, the ratio decidendi established the modern law of negligence by defining the duty of care owed by manufacturers to consumers.
• In R v. Brown, the ratio decided that consent cannot be a defense to actual bodily harm in unlawful activities.

• Donoghue v. Stevenson