The MDL Process Explained
When thousands of people are harmed by the same defective product, a single federal court cannot handle each case individually. Understanding how MDL works helps you know what to expect as your case moves through the system.
Key Takeaways
- MDL consolidates similar federal cases for pretrial proceedings only, not for trial
- The JPML decides whether to create an MDL and selects the transferee judge
- Plaintiffs' Steering Committees lead litigation strategy on behalf of all plaintiffs
- Bellwether trials help establish case values and encourage settlement
- Most MDL cases resolve through settlement rather than individual trials
This article walks through each stage of the MDL process, from the initial filing of lawsuits through the eventual resolution of claims, whether by settlement, trial, or remand to the original court.
What Happens Before an MDL Is Created
Before an MDL exists, individual plaintiffs file lawsuits in federal courts across the country. These cases may be filed in the district where the plaintiff lives, where the injury occurred, or where the defendant does business.
As similar cases accumulate in different districts, patterns emerge. Multiple judges begin handling the same legal issues. Defendants face repetitive discovery requests. The potential for inconsistent rulings grows. This is when consolidation becomes attractive.
Stage 1: The Motion for Transfer
The MDL process formally begins when someone files a motion asking the Judicial Panel on Multidistrict Litigation (JPML) to consolidate related cases.
Who Can File
Plaintiffs' Counsel
Most commonly file motions seeking consolidation. Coordination allows them to share resources, avoid duplicative work, and present a unified litigation strategy.
Defendants
May also seek consolidation, particularly when facing lawsuits in multiple districts. Centralization allows them to respond to discovery once rather than repeatedly.
The JPML Itself
Can issue a "show cause" order on its own initiative, directing parties to explain why cases should not be transferred.
Stage 2: The JPML Decision
The Judicial Panel on Multidistrict Litigation is a special panel of seven federal judges designated by the Chief Justice of the United States. No two panel members may come from the same federal circuit. Four members must concur for the panel to take any action.
The Transfer Standard
Under 28 U.S.C. § 1407, the JPML may transfer civil actions to a single district when:
- 1 The actions involve "one or more common questions of fact"
- 2 Transfer will be "for the convenience of parties and witnesses"
- 3 Transfer will "promote the just and efficient conduct of such actions"
The JPML holds oral argument six times per year in federal courthouses around the country. After argument, orders are typically issued within 10 days.
Stage 3: Tag-Along Cases
After an MDL is created, additional related cases continue to be filed. These new cases, called "tag-along" actions, can be transferred to the MDL through a streamlined process.
The JPML issues Conditional Transfer Orders (CTOs) for tag-along cases. Unless a party objects within the specified time period, the transfer becomes effective automatically. As of December 2025, approximately 198,000 individual actions are pending across all federal MDLs.
Stage 4: Appointment of Leadership
One of the transferee judge's first tasks is establishing a leadership structure to manage the plaintiff side of the litigation.
Plaintiffs' Steering Committee (PSC)
The court appoints experienced attorneys to lead the litigation on behalf of all plaintiffs. The PSC handles tasks benefiting all plaintiffs:
- Conducting discovery on common issues
- Hiring and working with experts
- Filing motions and briefs
- Negotiating with defendants
Your Individual Attorney's Role
Even with PSC leadership, your individual attorney remains responsible for your specific case. They ensure your interests are represented, keep you informed about developments, prepare your individual case materials, and ultimately advise you on settlement decisions.
Stage 5: Pretrial Proceedings
The core purpose of MDL is to coordinate pretrial proceedings efficiently. This phase includes discovery, motions practice, and preparation for potential trials.
Discovery
Common Discovery
Addresses issues affecting all plaintiffs:
- • How the defendant designed the product
- • What the defendant knew about risks
- • What warnings were provided
Conducted by the PSC on behalf of all plaintiffs.
Case-Specific Discovery
Addresses individual plaintiff issues:
- • When you used the product
- • What injuries you suffered
- • Your medical history
Handled by your individual attorney.
Plaintiff Fact Sheets
The court typically requires plaintiffs to complete detailed questionnaires called Plaintiff Fact Sheets (PFS). These standardized forms gather information about product use, injuries, medical history, and other case-specific facts. They help identify case characteristics for bellwether selection and provide defendants with consistent information.
Stage 6: Bellwether Trials
Bellwether trials are test cases selected to go to trial before the entire MDL is resolved. The term "bellwether" refers to a sheep that leads the flock, wearing a bell so the shepherd can locate the group.
Purpose of Bellwether Trials
Bellwether trial results are not binding on other plaintiffs in the MDL. However, bellwether outcomes profoundly influence the litigation. For more detail, see our guide on Bellwether Trials Explained.
Stage 7: Settlement
Most MDL cases resolve through settlement rather than individual trials. Settlement can occur at various points in the process.
Global Settlements
Resolve most or all cases in the MDL through a single negotiated agreement. Require high participation rates (typically 90-95%+) and court involvement in establishing claims processes.
Inventory Settlements
Resolve the cases held by particular law firms. These private agreements between defendants and individual firms are common throughout MDL litigation.
Individual Settlements
Resolve single cases based on their specific facts. Defendants may settle particularly strong cases or cases that would make poor bellwethers.
Large MDL settlements typically establish a settlement fund, claims administration processes, and criteria for evaluating individual claims. Plaintiffs do not automatically receive equal amounts—claims are evaluated based on injury severity, causation evidence, and product exposure.
Stage 8: Remand or Resolution
Cases that do not settle during MDL proceedings may be remanded to their original courts for trial. The JPML issues remand orders returning cases to the transferor districts where they were initially filed.
In practice, many remanded cases settle before trial, informed by the outcomes and valuations established during MDL proceedings. Rulings from the MDL court on common issues may have preclusive effect, and discovery materials developed in the MDL are available.
How Long Does the MDL Process Take?
MDL timelines vary significantly based on the complexity of the litigation, the number of pending cases, and the parties' willingness to settle.
Even when an MDL reaches a settlement, additional time is needed for claims administration and payment distribution. The total time from filing to receiving compensation often extends well beyond the formal litigation timeline.
Your Role as a Plaintiff
As an individual plaintiff in an MDL, your role includes:
Stay in Contact
Respond promptly to requests for information. Update your attorney if your contact information changes.
Complete Paperwork
Plaintiff Fact Sheets and other discovery materials require your participation. Accurate, complete responses are essential.
Preserve Evidence
Keep records of medical treatment, product use, and expenses related to your claim.
Be Patient but Engaged
MDL litigation takes time. While patience is necessary, you should still expect regular communication from your attorney.
The MDL Timeline at a Glance
Case Filing
Individual lawsuits are filed in various federal district courts. Attorneys begin building cases and gathering evidence.
JPML Petition & Transfer
Parties petition the JPML to consolidate cases. The JPML selects a transferee court and judge.
Leadership & Organization
The court appoints the Plaintiffs' Steering Committee and establishes case management procedures.
Pretrial Proceedings
Coordinated discovery, motions practice, expert qualification, and Plaintiff Fact Sheet completion.
Bellwether Trials
Select cases go to trial to test evidence and arguments. Verdicts inform settlement negotiations.
Resolution
Most cases resolve through global settlements. Remaining cases return to original courts for individual trials.
Frequently Asked Questions
Is my case automatically part of an MDL?
No. Your attorney must file your case in federal court, and the JPML must transfer it to the MDL. If your case is filed in state court, it remains there unless removed to federal court.
Do I have to participate in an MDL?
If your federal case is transferred to an MDL, you cannot opt out of the pretrial consolidation. However, you retain control over individual decisions including whether to accept any settlement offer.
Will my case go to trial?
Most MDL cases do not go to trial. The vast majority resolve through settlement. Even if you are selected for a bellwether trial pool, your case may settle before trial.
How is my attorney paid if the PSC does the work?
Your attorney's fee comes from your individual recovery. A portion of all recoveries (typically 3-11%) goes to a common benefit fund that compensates PSC attorneys for work benefiting all plaintiffs.
Can I fire my attorney during the MDL?
Yes, you retain the right to change attorneys. However, fee issues may arise regarding compensation for work already performed. Consult with any new attorney about how to handle the transition.
What if I disagree with how the PSC is handling the case?
The PSC represents the collective interests of plaintiffs, but your individual attorney represents you specifically. Discuss concerns with your attorney. In extreme circumstances, plaintiffs have sought court intervention, though this is rare.
How will I know if there's a settlement?
Your attorney should inform you of any settlement that affects your case. For global settlements, court-approved notice procedures typically apply.
What happens if the defendant goes bankrupt?
Bankruptcy complicates MDL proceedings significantly. Cases may be stayed (paused) while bankruptcy proceeds. Recoveries may be limited to what is available through the bankruptcy estate.
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Check Your EligibilitySources
- Rules of Procedure of the Judicial Panel on Multidistrict Litigation, Rule 8.1 (2016).
- JPML, "Checklist for Filing a New MDL Motion for 28 U.S.C. § 1407 Transfer."
- 28 U.S.C. § 1407(a) and (d); Cornell Law School Legal Information Institute.
- JPML, "Distribution of Pending MDL Dockets by Actions Pending," December 2025.
- Duke Law School Bolch Judicial Institute, "Guidelines and Best Practices for Large and Mass Tort MDLs" (2018).
- Fallon, Grabill & Wynne, "Bellwether Trials in Multidistrict Litigation," 82 Tulane Law Review 2323 (2008).
- Federal Judicial Center, "Bellwether Trials in MDL Proceedings: A Guide for Transferee Judges" (2019).
- Lexecon Inc. v. Milberg Weiss Bershad Hynes & Lerach, 523 U.S. 26 (1998).
Disclaimer: This article provides general educational information about the MDL process and is not legal advice. Every case is different, and legal deadlines vary by state and claim type. If you believe you have a potential claim, consult with a qualified attorney to discuss your specific situation. MDLUpdate.com does not provide legal representation.