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How can courts create procedural rules for future cases?

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Mosaic portrait of Emperor Justinian I with a jeweled crown and halo, from the 6th-century Basilica of San Vitale in Ravenna, Italy. — Procedural law Justinian I, detail of a 6th-century mosaic at the Church of San Vitale, Ravenna, Italy.

Courts create procedural rules for future cases through two primary methods: explicit rule-making and the development of judicial precedent.

Explicit Rule-Making

In many jurisdictions, such as the United States, legislative bodies delegate the authority to regulate court procedure directly to the judiciary. This allows courts to act in a legislative capacity by openly promulgating general rules for the future. For example, the U.S. Congress has granted the Supreme Court the power to formulate and amend rules of civil, criminal, and appellate procedure. These rules are designed to manage the day-to-day operations of the judicial system and are distinct from the ad hoc decisions made during individual cases.1

Judicial Precedent

Courts also create rules for future cases as a by-product of deciding individual disputes. In common-law systems, this process is known as stare decisis, where judicial decisions become precedent that guides or binds future rulings. By interpreting statutes or filling gaps where no legislation exists, judges establish principles that ensure uniformity and predictability in the law. Even in civil-law systems, where precedent is not technically binding, judicial interpretations of vague or unforeseen legal provisions often carry significant influence and serve as a guide for future litigation.2