1 Who is Seeking to Assert a Claim or Join a Party?
Party Posture2 Identify the Specific Joinder Device Attempted
Target DeviceUnder Rule 14, Defendant may only implead a non-party who "is or may be liable to it for all or part of the claim against it" (indemnity, contribution, subrogation). Rule 14 cannot be used to argue "It was him, not me!"
3 Subject-Matter Jurisdiction & 28 U.S.C. § 1367 Screening
SMJ & SupplementalJoinder Diagnostic Result
RULE 18(a)Supplemental jurisdiction is expressly denied for claims by plaintiffs against parties joined under Rule 14, 19, 20, or 24 when inconsistent with § 1332 complete diversity.
Memorandum Decision & Order
Civ. No. 25-cv-8812 (FRCP Joinder Practice)Interactive Visual Joinder Map
Click any party relationship or arrow below to inspect the governing Federal Rule and statutory jurisdictional constraints.
Click on any party block or connection arrow above to view its operational FRCP test, subject-matter jurisdictional mechanics, and danger traps.
Broad Grant to the Outer Boundary of Article III
Supplemental jurisdiction automatically extends to all claims that are so related to the anchor claim that they form part of the same constitutional case or controversy under the Gibbs "common nucleus of operative fact" test. This expressly includes claims that involve the joinder of additional parties.
The Asymmetric Shield Against Plaintiffs
If the anchor lawsuit is in federal court solely on diversity (§ 1332), § 1367(b) strips away supplemental jurisdiction over claims asserted by PLAINTIFFS against persons made parties under Rule 14, 19, 20, or 24 (or claims by Rule 19 or 24 intervenor plaintiffs), if complete diversity would be destroyed!
Comprehensive FRCP Joinder Master Matrix
Procedural tests, timing constraints, § 1367 applicability, and controlling Supreme Court precedents.
| Device & Rule | Asserted By | Procedural Prerequisite | Compulsory or Permissive? | § 1367(b) Bar App? | Leading Precedent |
|---|---|---|---|---|---|
|
Rule 18(a) Claim Joinder |
Any claiming party (P, D, 3PD) | Party must already have an initial valid claim against that opponent. May join any independent or alternative claims. | Permissive | No bar (Need SMJ for each claim; aggregation permitted) | FRCP 18(a) |
|
Rule 20 Permissive Party Joinder |
Plaintiffs or against multiple Defendants | Two Prongs: (1) Same T/O or series of T/Os; AND (2) Common question of law or fact. | Permissive | YES on P against co-Ds. (Co-Ps lack $75k saved by Allapattah if diverse). | Exxon Mobil v. Allapattah |
|
Rule 13(a) Compulsory Counterclaim |
Defending party vs. Opposing party | Arises out of the same transaction or occurrence as the opposing party's claim. | COMPULSORY (Waived if not pleaded in answer!) | NO BAR (Defendant claim; gets § 1367(a) automatically) | United Mine Workers v. Gibbs |
|
Rule 13(b) Permissive Counterclaim |
Defending party vs. Opposing party | Any claim that does NOT arise out of the same T/O. | Permissive | Fails § 1367(a) (Not same T/O; MUST have independent SMJ) | FRCP 13(b) |
|
Rule 13(g) Crossclaim |
Party against a Co-Party (e.g. D1 vs D2) | Must arise out of the same T/O as the original action or a counterclaim. | Always Permissive (Never compulsory) | NO BAR (Between co-parties; gets § 1367(a)) | FRCP 13(g) |
|
Rule 14(a) Third-Party Impleader |
Defendant (as 3P-Plaintiff) vs. Non-Party | Must assert derivative liability (indemnity, contribution) for plaintiff's claim against defendant. | Permissive (Within 14 days of answer as of right) | NO BAR on D's impleader claim. (BUT P's direct claim on 3PD is BARRED!) | Owen Equipment v. Kroger |
|
Rule 19 Compulsory Joinder |
Court on motion (or sua sponte) | 3 Steps: (1) Necessary party? (2) Joinder feasible? (3) If not feasible, indispensable under 19(b)? | COMPULSORY (May force dismissal under 12(b)(7)) | YES (§ 1367(b) expressly denies supp. juris. to Rule 19 absentees) | Provident Tradesmens Bank |
|
Rule 24 Intervention |
Absent Non-Party seeking to enter suit | 24(a) Right: Interest in subject matter impaired without adequate rep. 24(b) Permissive: Common question of law/fact. |
Permissive motion | YES on intervenor PLAINTIFFS under § 1367(b) | FRCP 24 |
💰 Interpleader Showdown: Rule 22 vs. Statutory 28 U.S.C. § 1335
- Subject-Matter Juris: Standard requirements. Needs Complete Diversity (Stakeholder vs. all Claimants) + >$75,000, OR a Federal Question.
- Personal Jurisdiction & Service: Standard Rule 4 service within forum state.
- Venue: Regular 28 U.S.C. § 1391 venue rules.
- Deposit Requirement: Deposit of the fund with court registry is not required.
- Subject-Matter Juris: Minimal Diversity between at least TWO adverse claimants (stakeholder's citizenship is irrelevant!).
- Amount in Controversy: Only $500 or more.
- Personal Jurisdiction & Service: Nationwide service of process (28 U.S.C. § 2361).
- Venue: District where any claimant resides (28 U.S.C. § 1397).
- Deposit Requirement: MANDATORY deposit of fund or bond with court.
Civil Procedure Joinder Hypotheticals
Six high-yield litigation dilemmas testing the collision of the FRCP with 28 U.S.C. §§ 1332 and 1367.
Plaintiff's Direct Claim Against Third-Party Defendant
View Doctrinal Model Solution ▼
1. Procedural Permission under Rule 14(a)(3): Rule 14(a)(3) expressly permits a plaintiff to assert against a third-party defendant any claim arising out of the transaction or occurrence that is the subject matter of plaintiff's claim against the defendant.
2. The § 1367(b) Diversity Bar: Under Owen Equipment & Erection Co. v. Kroger (1978), codified in 28 U.S.C. § 1367(b), in an action founded solely on diversity, the district court lacks supplemental jurisdiction over claims by plaintiffs against persons made parties under Rule 14 when exercising jurisdiction would be inconsistent with § 1332 complete diversity. Because Paula and Owen are both citizens of Iowa, complete diversity is destroyed. Paula's claim against Owen MUST be dismissed for lack of subject-matter jurisdiction.
Rule 20 Permissive Co-Plaintiff With Sub-$75,000 Claim
View Doctrinal Model Solution ▼
1. Procedural Joinder Met: Abigail and Ben satisfy Rule 20(a)(1) because their claims arise from the same transaction or occurrence (the explosion) and share common questions of law and fact (ChemCorp's liability).
2. Supplemental Jurisdiction under Exxon Mobil v. Allapattah: Under Exxon Mobil Corp. v. Allapattah Services, Inc. (2005), as long as complete diversity is not contaminated (Abigail and Ben are FL; ChemCorp is DE/TX) and at least ONE named plaintiff satisfies the >$75,000 threshold (Abigail), § 1367(a) confers supplemental jurisdiction over co-plaintiffs whose claims share a common nucleus of operative fact. Crucially, § 1367(b) does NOT withhold supplemental jurisdiction over claims by additional co-plaintiffs joined under Rule 20 who fail to satisfy the amount in controversy. The district court has supplemental jurisdiction over Ben's $15,000 claim.
The Absent Joint Tenant and Rule 19 Indispensability
View Doctrinal Model Solution ▼
1. Step 1 (Necessary Party): Seller 2 is a required party under Rule 19(a)(1) because conveying title directly impacts Seller 2's joint ownership interest, and without Seller 2, the court cannot accord complete relief or bind full title.
2. Step 2 (Feasibility): Joinder is NOT feasible because Seller 2 is a citizen of New York, and joining Seller 2 as a defendant destroys complete diversity with Buyer (New York) under Strawbridge v. Curtiss. Supplemental jurisdiction is unavailable under § 1367(b).
3. Step 3 (Indispensable Party Analysis): Under Rule 19(b), the court balances the 4 factors: severe prejudice to Seller 2's property rights, inability to shape judgment without conveying Seller 2's interest, and Buyer has an adequate alternative forum in New York state court. The court will deem Seller 2 indispensable and DISMISS the action under Rule 12(b)(7).
The Omitted Collision Claim and Claim Preclusion
View Doctrinal Model Solution ▼
1. Violation of Rule 13(a): Motorist B's claim arose out of the exact same transaction or occurrence (the vehicular collision) as Trucker A's claim and was possessed by Motorist B at the time of serving the answer. It did not require adding parties over whom the court lacked jurisdiction.
2. Permanent Forfeiture / Preclusion: Under Rule 13(a), compulsory counterclaims must be pleaded in the answer or they are permanently waived and barred by claim preclusion. Motorist B is precluded from asserting this claim in any subsequent state or federal action.
Joinder & § 1367 Mastery Drill
Test your command over Rules 13, 14, 18, 19, 20, 22, 24 and statutory supplemental limits.