Predominance

Predominance is the requirement that shared legal or factual questions outweigh individual questions when a federal court considers certifying a class under Federal Rule of Civil Procedure 23(b)(3). The court examines the importance of the issues and how they can be proved, rather than simply counting how many questions the class members share.

For example, a challenge to a standardized charge may turn on records and a policy that apply across the group. Other disputes may require different evidence about each person’s experience. The court considers whether the shared questions carry enough weight to justify resolving the case through class treatment. Predominance is one requirement of Rule 23(b)(3), alongside other certification requirements, including whether a class action is superior to available alternatives.

Predominance is more demanding than commonality, the requirement that the class have common legal or factual questions under Rule 23(a)(2). In Amchem Products v. Windsor, the Supreme Court explained that predominance tests the class’s cohesion and still applies when certification is sought for settlement. A shared desire to receive compensation does not replace that analysis.

Individual differences do not always prevent certification. In Tyson Foods v. Bouaphakeo, the Supreme Court explained that central shared issues can predominate even when damages or some individual defenses require separate consideration. Whether they do depends on the claims, evidence and applicable law.

You may see predominance discussed in a certification order or settlement approval filing. It concerns whether the proposed group can proceed under this class-action rule, rather than your individual payment calculation. Your eligibility, claim requirements and deadlines come from the class definition and governing settlement documents. State-court class-action rules can differ from the federal standard.