Also known as:certifies the class · certified the class · certifying the class · class certification · certification of the class
Written by attorneys · grounded in primary & secondary sources — see below
A court's determination that a civil action satisfies the prerequisites of Federal Rule of Civil Procedure 23 and may proceed on behalf of the defined class.
Sources & Authorities
How it applies
Common Examples
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Diversity Interest Claims
Cade Carpenter, an independent pharmacy owner, sued Meridian Labs in federal court under diversity jurisdiction for statutory interest on late rebates. Meridian invoked a state statute barring class actions for such claims. The court applied Rule 23 to decide certification and allowed the class to proceed because the federal rule controlled.
Supplemental Jurisdiction Over Class Claims
Christian Coleman and other dealers sued Exxon Mobil for overcharges, each seeking less than the jurisdictional minimum. The court certified the class after confirming that one plaintiff's claim satisfied the amount in controversy and supplemental jurisdiction extended to the rest.
Select any source to read its text and confirm it supports the definition.
Cases
Statutes
Federal Rules
Casebooks
Exxon Mobil Corp. v. Allapattah Services, Inc.545 U.S. 546, 558–59 (2005)
Mootness After Certification
Camila Cervantes challenged Iowa's residency requirement for divorce while representing a class of similarly situated plaintiffs. After she satisfied the residency period, the court held that certification preserved the case because the class retained a live controversy.
Sosna v. Iowa419 U.S. 393 (1975)
Commonality Requirement
Charlotte Chung and other female employees sued Wal-Mart alleging gender discrimination in pay and promotions. The court denied certification because the plaintiffs could not show a common policy or practice affecting the entire proposed class.
Wal-Mart Stores, Inc. v. Dukes564 U.S. 338 (2011)
Settlement Class Issues
Craig Caldwell and other asbestos claimants sought approval of a global settlement class against Amchem. The court refused certification because the proposed class failed the predominance and adequacy requirements for a settlement-only class.
Amchem Products, Inc. v. Windsor521 U.S. 591 (1997)
Arbitration Stay Pending Certification
Cassandra Cooper sued Moses H. Cone Memorial Hospital for construction defects and sought class treatment. The court stayed the federal action to allow state-court resolution of related issues before deciding whether to certify the class.
Moses H. Cone Memorial Hospital v. Mercury Constr. Corp.460 U.S. 1, 10–12 (1983)
Common questions
Frequently Asked
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Can a court change its decision on class certification after it is granted?+
Yes. An order granting or denying class certification may be altered or amended before final judgment.
Supporting sources
What does a class certification order mean under federal law?+
It is an order issued by a court approving the treatment of some or all aspects of a civil action as a class action.
Supporting sources
Does the timing of a class certification order affect the application of federal jurisdictional rules?+
No. The relevant jurisdictional subsection applies to any class action before or after the entry of a class certification order.
Supporting sources
How does certification protect absent class members?+
Courts must certify the class, appoint class counsel, approve settlements, and direct reasonable notice to class members to safeguard absent parties' interests.
Supporting sources
485 U.S. 224 (1988)Business Associations
…of reliance supported by the fraud-on-the-market theory. 6. That presumption, however, is rebuttable. 7. The District Court's certification of the class here was appropriate when made but is subject on remand to such adjustment, if any, as developing circumstances demand. The judgment of the Court of Appeals is vacated, and the case is…