⚡ 10-Second Rule
One person can sue for a whole crowd if the crowd is big, alike, and well-championed.
🧒 ELI-10 Scene
Four hundred kids at Maplewood Elementary bought the same scooter, and every kickstand snapped the same way. The principal won't hear four hundred separate complaints. So Jade steps up to speak for everyone. The principal checks four things. The crowd is too big for one-by-one meetings. Everyone's problem is the same snapped kickstand. Jade's own scooter broke exactly like the others. And Jade will genuinely fight for every kid, not just herself. If the fix is money, each kid gets a note home and may say, "leave me out — I'll complain myself."
⚖️ Actual Rule
Rule 23(a) sets four prerequisites for any class: numerosity (the class is so numerous that joinder of all members is impracticable), commonality (questions of law or fact common to the class), typicality (the representatives' claims are typical of the class's), and adequacy (the representatives will fairly and adequately protect class interests). The class must also fit a Rule 23(b) category: (b)(1) covers cases where individual suits would risk inconsistent standards of conduct for the opponent or would practically impair absent members' interests; (b)(2) covers claims for injunctive or declaratory relief where the party opposing the class acted on grounds generally applicable to the whole class; and (b)(3) — the damages class — additionally requires that common questions predominate over individual ones and that a class action be superior to other methods. Only (b)(3) classes require the best notice practicable, including individual notice to identifiable members, with the right to opt out. Fed. R. Civ. P. 23(c)(2)(B). Certification comes by court order under 23(c)(1); a court of appeals may permit an interlocutory appeal of a certification order if sought within 14 days, Fed. R. Civ. P. 23(f); and class settlements bind members only with court approval after a fairness hearing, Fed. R. Civ. P. 23(e).
Jurisdiction: in an ordinary diversity class action, only the named representatives' citizenship counts, Supreme Tribe of Ben-Hur v. Cauble, 255 U.S. 356 (1921), and if one named plaintiff's claim exceeds $75,000, supplemental jurisdiction can carry class members with smaller claims, Exxon Mobil Corp. v. Allapattah Services, Inc., 545 U.S. 546 (2005). The Class Action Fairness Act, 28 U.S.C. § 1332(d), separately grants federal jurisdiction over class actions where the aggregate amount in controversy exceeds $5,000,000, any class member is diverse from any defendant (minimal diversity), and the proposed class has at least 100 members, subject to statutory carve-outs for primarily local controversies.
ELI-10 translation: big crowd, same problem, matching champion who fights hard — and money classes get mail plus an exit door.
🔍 Ask These Questions
- Is the class too numerous for ordinary joinder? (Four hundred kids can't each get a meeting.)
- Are there common questions, and are the representative's claims typical? (Did everyone's kickstand snap the same way, including Jade's?)
- Will the representative and counsel adequately protect absent members? (Will Jade truly fight for kids she's never met?)
- Which 23(b) box fits — inconsistent-standards risk, class-wide injunction, or predominating damages questions? (Pick the right container before pouring in the crowd.)
- If (b)(3), was the best practicable notice with opt-out rights given? (Money cases require the note home and the exit door.)
- Is there jurisdiction — named-representative diversity, or CAFA's $5 million, minimal diversity, and 100 members? (Check the courthouse key before the crowd walks in.)
- Does any settlement have court approval after a fairness hearing? (The principal must bless any deal made for absent kids.)
⚠️ Bar Trap
Exam language: Examiners attach (b)(3)'s baggage to every class. Mandatory individual notice and opt-out rights belong only to (b)(3) damages classes; members of (b)(1) and (b)(2) classes are bound with no opt-out right, and notice there is discretionary. The mirror trap is jurisdictional: answer choices demanding complete diversity or a per-member $75,000 in a CAFA case — CAFA needs only minimal diversity and a $5 million aggregate.
ELI-10: Not every class gets the note home and the exit door — only money classes do. And the crowd-lawsuit statute counts everyone's claims together, not one by one.
🧪 Question
A regional bank adopted a policy of denying online-account access to all customers over age seventy-five, requiring them to bank in person. A retired teacher filed a class action in federal court on behalf of the roughly 6,000 affected customers, seeking only an injunction barring enforcement of the policy and a declaration that it is unlawful. The district court found the Rule 23(a) prerequisites satisfied and certified the class under Rule 23(b)(2). A class member who prefers to negotiate individually with the bank objects that the certification is invalid because the court did not order individual notice to class members or give them an opportunity to opt out.
Is the objection likely to succeed?
(A) Yes, because due process requires an opt-out opportunity before any absent class member may be bound. (B) Yes, because Rule 23 requires the best notice practicable in every certified class action. (C) No, because mandatory individual notice and opt-out rights apply only to classes certified under Rule 23(b)(3). (D) No, because notice and opt-out rights are never required in any class action.
Answer: (C). Rule 23(c)(2)(B)'s mandatory notice and opt-out regime attaches only to (b)(3) damages classes; in a (b)(2) injunctive class built on conduct generally applicable to the group, members are bound without an opt-out right, and any notice is left to the court's discretion under 23(c)(2)(A).
💡 Why the Wrong Answers Are Wrong
- (A) overreads due process, which requires opt-out protections for damages claims, not for cohesive classes seeking uniform injunctive relief.
- (B) lifts the "best notice practicable" language from 23(c)(2)(B), which by its terms governs only (b)(3) classes.
- (D) reaches the right result by a wrong rule; notice and opt-out are required — just exclusively in the (b)(3) setting.
- ELI-10: The misconception is assuming every class member always gets a letter and an escape hatch. When everyone shares one fix, everyone is simply in.
