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Why does stare decisis help make court decisions predictable?

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King Henry II and St. Thomas Becket — Common law Henry II (left) disputing with Thomas Becket (center), miniature from a 14th-century manuscript; in the British Library (Cotton MS. Claudius D.ii).

The principle of stare decisis—Latin for "to stand by decided matters"—promotes predictability in the law by requiring that courts treat similar cases in a similar manner.1

By relying on precedent, judges ensure that if an individual is treated in a certain way today, another person engaging in substantially identical conduct under similar conditions will be treated the same way in the future. This consistency is essential because the fundamental goal of the law is to render uniform and predictable justice.1

Beyond ensuring fairness, this system allows judges to avoid the repetitive effort of working out fresh solutions for the same problems each time they arise. While judges may distinguish or overturn earlier decisions if they are found to be unwise or unsuited for current application, the general expectation to follow established rulings provides a stable framework that allows citizens and legal professionals to anticipate how the law will be applied.1