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Why do common-law courts separate questions of fact from questions of law?

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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.

In common-law systems, the separation of questions of fact from questions of law is a fundamental procedural requirement necessitated by the use of the jury trial.1

Because the jury is composed of laypersons rather than professional judges, the legal system must clearly distinguish between factual and legal issues from the outset of a case. The jury is tasked with deciding questions of fact, while the judge is responsible for deciding questions of law. This division ensures that the jury can focus on resolving factual disputes based on the evidence presented, while the judge maintains authority over the application of legal principles.12

This distinction is less critical in civil-law procedures, where professional judges typically decide both questions of fact and law, often eliminating the need for a sharp separation until a case reaches the highest appellate levels. In the common-law tradition, this clear division is essential to the adversarial nature of the proceedings, ensuring that the roles of the fact-finder and the legal arbiter remain distinct to uphold the integrity of the trial.12