Impleader vs Intervention in Law - What is The Difference?

Last Updated Feb 2, 2025

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Table of Comparison

Aspect Intervention Impleader
Definition A third party voluntarily joins ongoing litigation to protect their interests. A defendant brings a third party into a lawsuit alleging liability related to the original claim.
Purpose Protect the intervener's legal interest in the case outcome. Shift liability or seek indemnity from the third party.
Initiator Third party seeking to join the case. Original defendant seeking contribution or indemnity.
Requirement Must have a direct, significant interest in the case. Must allege derivative liability related to the main claim.
Consent Often requires court permission; can be permissive or mandatory. Requires court permission; procedural rules govern impleader actions.
Legal Basis Rules of Civil Procedure (e.g., Fed. R. Civ. P. 24 in US). Rules of Civil Procedure (e.g., Fed. R. Civ. P. 14 in US).
Effect on Litigation Adds parties defending their own interests, potentially complicating matters. Brings in third party as additional defendant to resolve related claims.

Overview of Third-Party Procedures in Litigation

Intervention allows a non-party with a direct interest in the outcome to join ongoing litigation, asserting their own claims or defenses. Impleader enables a defendant to bring a third party into the lawsuit, shifting liability related to the plaintiff's original claim. Both procedures streamline dispute resolution by consolidating related claims involving third parties into a single legal action.

Defining Intervention and Its Legal Basis

Intervention allows a third party to become involved in ongoing litigation due to a direct interest in the subject matter, granting the intervener the right to protect their legal interests. It is governed primarily by Federal Rule of Civil Procedure 24, which permits intervention as of right or by permission of the court. Intervention ensures that parties affected by the dispute can participate to prevent inconsistent judgments and protect their rights without initiating separate actions.

Understanding Impleader in Civil Procedure

Impleader is a procedural device in civil litigation allowing a defendant to bring a third party into a lawsuit, alleging that this third party is liable for some or all of the plaintiff's claim. Unlike intervention, which permits a non-party to join a case voluntarily due to a direct interest in the outcome, impleader involves a defendant seeking indemnity or contribution from the third party under Federal Rule of Civil Procedure 14. This mechanism streamlines liability resolution by consolidating related claims, reducing multiple lawsuits, and promoting judicial efficiency in complex cases.

Key Differences Between Intervention and Impleader

Intervention allows a nonparty to join an ongoing lawsuit to protect their own interests, whereas impleader enables a defendant to bring a third party into the case who may be liable for all or part of the plaintiff's claim. Intervention is governed by Federal Rule of Civil Procedure 24, distinguishing between intervention as of right and permissive intervention, while impleader follows Rule 14, focusing on third-party claims. The key difference lies in the purpose: intervention asserts the intervenor's independent rights, whereas impleader shifts liability to a third party connected to the defendant.

Purposes and Strategic Uses of Intervention

Intervention allows a nonparty to join ongoing litigation to protect their own interests, often used to safeguard rights that could be affected by the judgment. It strategically enables a party to influence the case's outcome without initiating a separate lawsuit, preserving judicial efficiency. Impleader, by contrast, involves a defendant bringing a third party into the litigation to share liability, primarily used to distribute responsibility rather than to protect independent rights.

Strategic Advantages of Impleader

Impleader provides strategic advantages by allowing a defendant to bring a third party into the lawsuit who may be liable for all or part of the plaintiff's claim, thereby shifting or sharing legal responsibility. This mechanism promotes judicial efficiency by resolving related claims together, reducing the risk of inconsistent rulings and multiple lawsuits. Unlike intervention, which permits a non-party to join in defense of its interests, impleader proactively targets potential liabilities, enhancing the defendant's ability to manage risk and control litigation outcomes.

Procedural Requirements for Intervention

Intervention requires a timely motion demonstrating a legally protected interest related to the subject matter of the lawsuit, supported by facts showing the applicant's ability to protect that interest without unduly delaying or prejudicing the original parties. Intervenors must comply with jurisdictional requirements and often need court approval, adhering to local rules on pleading, notice, and service processes. The procedural standards differ from impleader, which typically involves a defendant bringing a third party into the case to share liability, following distinct rules under Federal Rule of Civil Procedure 14.

Procedural Steps for Impleader

Impleader involves a defendant bringing a third party into a lawsuit who may be liable for all or part of the plaintiff's claim, initiated by filing a third-party complaint. The procedural steps for impleader include serving the third-party complaint and summons on the third party, who then must respond to the complaint within the designated time frame under Federal Rules of Civil Procedure Rule 14. The third party becomes involved in the case, allowing the court to adjudicate related claims simultaneously, streamlining litigation and potentially reducing inconsistent judgments.

Practical Examples: Intervention vs. Impleader

In a lawsuit where a third party claims an interest related to the property or transaction at issue, intervention allows that party to join the case voluntarily, such as a neighbor intervening in a property boundary dispute to protect their easement rights. Impleader occurs when a defendant brings in another party alleged to be liable for all or part of the plaintiff's claim, for example, a manufacturer impleading a supplier for defective components causing a product liability suit. These practical examples highlight intervention as a protective mechanism for interested outsiders, while impleader serves as a defensive strategy to shift or share liability.

Choosing the Right Mechanism: Factors to Consider

Choosing between intervention and impleader depends on factors such as the timing of the request, the nature of the relationship between parties, and the desired legal outcome. Intervention is appropriate when a non-party seeks to join ongoing litigation to protect their own interests directly affected by the case. Impleader allows the defendant to bring a third party into the lawsuit to share liability or provide indemnification, typically when the third party may be responsible for all or part of the plaintiff's claim.

Intervention Infographic

Impleader vs Intervention in Law - What is The Difference?


About the author. JK Torgesen is a seasoned author renowned for distilling complex and trending concepts into clear, accessible language for readers of all backgrounds. With years of experience as a writer and educator, Torgesen has developed a reputation for making challenging topics understandable and engaging.

Disclaimer.
The information provided in this document is for general informational purposes only and is not guaranteed to be complete. While we strive to ensure the accuracy of the content, we cannot guarantee that the details mentioned are up-to-date or applicable to all scenarios. Topics about Intervention are subject to change from time to time.

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