Also known as: operative facts
Written by attorneys · grounded in primary & secondary sources — see below
A fact that is central to the determination of a legal issue in a proceeding. It directly affects how the law applies to the parties rather than serving as mere background or context. Courts and agencies rely on operative facts to decide questions such as jurisdiction, liability, or the validity of government action.
Opal Okoro, a citizen of State A, sues Orbit Communications in federal court for $90,000 in damages arising from a contract breach. She joins Orlando Okafor, also a citizen of State A, whose related breach claim totals only $40,000. The court exercises supplemental jurisdiction over Okafor's claim because both claims arise from the same events surrounding the contract negotiations and performance.
Oriana Oberman brings a federal copyright claim against Oasis Resorts in federal court after the resort used her photographs without permission. She adds a state-law unfair-competition claim based on the same unauthorized use and marketing campaign. The court hears the state claim because the federal and state allegations rest on identical events in the resort's promotional activities.
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Oliver Okeke openly possesses a parcel of land owned by Osprey Aviation for the full statutory period. The court holds that title vests in Okeke because the expiration of the limitations period is the controlling event that divests the original owner.
Oakley Osei, an employee injured at work, recovers under the workers' compensation statute from his employer. His spouse, Oswald Orozco, then sues the employer in tort for loss of consortium arising from the identical workplace accident. The court permits the spouse's claim because it rests on an independent duty owed directly to the spouse even though the underlying events match those supporting the compensation award.
After a jury acquits Orlando Okafor of robbery because it finds the state failed to prove he was the masked perpetrator, the state attempts to retry him using clearer video evidence. The court bars the second prosecution because the first jury necessarily decided the identity issue in Okafor's favor.
School officials suspend Oriana Oberman for ten days after a lunchroom disturbance without first determining what actually occurred. The court holds that due process requires a hearing to establish the operative facts before imposing the suspension.
The test requires that the federal and state claims arise from the same set of events so that a plaintiff would ordinarily try them together. When the operative facts overlap, the federal court may hear the additional claims even if they lack an independent jurisdictional basis.
An operative fact directly controls how the law applies to the parties and is weighed by the decision-maker. Background facts supply context but do not determine the outcome of the specific dispute.
The expiration of the statutory period itself divests the original owner of title and vests it in the possessor. Other conduct during the period merely satisfies the elements that trigger that legal consequence.
…power in federal courts to hear the whole," the Court said, when the state and federal claims "derive from a common nucleus of operative fact" and are so linked that the plaintiff "would ordinarily be expected to try them all in one judicial proceeding." Id. , at 725. Gibbs involved the linkage of federal and state claims…