Predominance and superiority
Predominance and superiority are Rule 23(b)(3) tests: shared questions must outweigh individual ones, and a class action must be the better way to proceed.
Also called: predominance requirement, superiority, Rule 23(b)(3), predominance and superiority
Predominance and superiority are Rule 23(b)(3) tests: shared questions must outweigh individual ones, and a class action must be the better way to proceed.
What it means
Predominance and superiority are the two extra tests a class seeking money damages has to pass under Rule 23(b)(3). Predominance asks whether the questions shared by the class predominate, meaning they outweigh the questions that differ from person to person. Superiority asks whether a class action is a better way to resolve the dispute than the alternatives.
For predominance, the judge compares the shared issues with the individual ones. A shared issue might be whether a fee was properly disclosed. An individual one might be how much each person lost. If proving each person's claim would take a mini-trial, individual issues may win out. The Supreme Court has said the test asks whether the class is cohesive enough to be handled through representation.
For superiority, the rule lists four things the court weighs:
- how much class members want to control their own cases
- whether related lawsuits are already underway
- whether it makes sense to bring the claims together in one court
- how hard the class action would be to manage
When each person's claim is small, a class action is often the only realistic way to be heard.
What it means for you
These tests decide whether most consumer cases can be class actions at all. They fit small, similar harms like a hidden fee or a privacy violation, and fit poorly when each person's injury and damages differ. In a settlement class, the judge doesn't have to ask how a trial would be managed, but still has to look closely at whether common issues predominate. If a court finds predominance missing, people with individual injuries may need to pursue their own claims instead, sometimes in a mass tort. The class definition and payment terms in your notice show how the case was framed.
Example
Say a software company raised a subscription price without notifying users, and each user lost a few dollars. Whether the notice was adequate is one question for everyone, so common issues predominate. A class action is also the practical way to resolve it, since no one would sue over a few dollars. If instead each user claimed a different personal injury, individual questions would swamp the common ones.
FAQ
When each person's injury and damages differ a lot, individual questions tend to outweigh common ones, so a court may refuse to certify a damages class. Those claims often go forward as separate lawsuits, sometimes coordinated together in a multidistrict litigation.
Related terms
- Fed. R. Civ. P. 23, Class Actions (Cornell Legal Information Institute)
- Amchem Products, Inc. v. Windsor, 521 U.S. 591 (1997) (U.S. Reports, Library of Congress)
Updated Oct 18, 2026. Plain-English definitions for general information — not legal or tax advice.