In federal civil cases, discoverable information in litigation is any nonprivileged material that is relevant to a party’s claim or defense and proportional to the needs of the case. That standard comes from Federal Rule of Civil Procedure 26(b)(1), and it is deliberately broad.1Legal Information Institute. Federal Rules of Civil Procedure Rule 26 If something could help prove or disprove an issue in the case, assume it is on the table unless a specific privilege or protection shields it.
Relevant and Proportional: The Two-Part Test
Relevance is the first filter, but it is not the only one. Courts weigh proportionality by looking at the importance of the issues, the amount in controversy, each party’s relative access to the information, the parties’ resources, and whether the burden of production outweighs the likely benefit.1Legal Information Institute. Federal Rules of Civil Procedure Rule 26 A demand for a decade of company-wide emails in a $15,000 contract dispute will not survive that test.
Relevance for discovery is also broader than relevance at trial. Material does not have to be admissible as evidence to be discoverable. If it could reasonably lead to admissible evidence, it falls inside the scope. Litigants who assume they can withhold a document because a hearsay or authentication rule would keep it out at trial are mistaken. Hand it over, then fight about admissibility later.
What You Have to Disclose Without Being Asked
Federal practice does not wait for the other side to serve a request. Rule 26(a)(1) requires each party to produce four categories of information automatically, usually within 14 days after the parties’ discovery planning conference:1Legal Information Institute. Federal Rules of Civil Procedure Rule 26
- The name, address, and telephone number of every person likely to have discoverable information you may use to support your claims or defenses, along with the subjects of that information.
- A copy, or a description by category and location, of all documents, electronically stored information, and tangible things in your possession that you may use to support your position.
- A computation of each category of damages you are claiming, with the underlying documents and evidence of the injuries.
- Any insurance agreement under which an insurer could be liable to satisfy part or all of a judgment.
These are not optional. Failing to list a witness or document in your initial disclosures can keep you from using it later.
Categories of Discoverable Material
Electronically Stored Information
Electronically stored information, usually called ESI, dominates modern discovery. Emails, text messages, instant messages, internal memos, spreadsheets, and database records all qualify. So does metadata, the behind-the-scenes record of when a file was created, modified, or accessed and by whom. In a case alleging a backdated contract, the metadata on the document file can be more revealing than the contract itself.
Because a mid-sized company can generate millions of emails a year, proportionality fights are constant. Courts routinely narrow ESI requests by custodian, date range, or search terms to keep costs under control.
Physical Documents and Property
Signed contracts, financial records, maintenance logs, personnel files, and medical records remain staples. Rule 34 also lets a party enter another party’s land or property to inspect, measure, photograph, test, or sample it.2Legal Information Institute. Federal Rules of Civil Procedure Rule 34 – Producing Documents, Electronically Stored Information, and Tangible Things, or Entering onto Land, for Inspection and Other Purposes In a construction defect case, that might mean the plaintiff’s engineer walking the defendant’s building to pull soil samples and photograph foundation cracks. The request has to describe what will be inspected with reasonable specificity and set a reasonable time and manner.
Witnesses and Expert Reports
Parties must identify every person with knowledge relevant to the case, including eyewitnesses, employees, and consultants.1Legal Information Institute. Federal Rules of Civil Procedure Rule 26 Testifying experts carry an extra load. Each one must produce a written report stating all opinions and the basis for them, the facts and data considered, exhibits the expert will use, qualifications and publications from the last ten years, every case the expert has testified in over the previous four years, and the compensation for the engagement. The report lets the other side see what the expert will say long before trial.
How the Other Side Will Request It
Interrogatories
Interrogatories are written questions answered in writing under oath. Each side gets 25 of them, subparts included, unless the parties agree otherwise or the court permits more. Answers are due within 30 days of service.3Legal Information Institute. Federal Rules of Civil Procedure Rule 33 – Interrogatories to Parties The cap forces lawyers to target key facts, documents, and legal theories rather than fish.
Requests for Production
These ask for specific documents, electronic files, or physical items, or for access to inspect property. The request must describe what is sought with reasonable particularity, and the responding party has 30 days to produce the materials or state objections.2Legal Information Institute. Federal Rules of Civil Procedure Rule 34 – Producing Documents, Electronically Stored Information, and Tangible Things, or Entering onto Land, for Inspection and Other Purposes There is no numerical cap, which is why document fights fill motion dockets.
Depositions
A deposition puts a witness under oath to answer questions orally on the record. Each side is limited to 10 depositions without court permission, and each one is capped at a single day of seven hours.4Legal Information Institute. Federal Rules of Civil Procedure Rule 30 – Depositions by Oral Examination The court can grant more time if the examination is being obstructed or if a fair examination genuinely requires it. Depositions lock in testimony under penalty of perjury and let the lawyers judge how a witness will play to a jury.
Requests for Admission
Requests for admission ask the other side to confirm or deny specific factual statements, narrowing what has to be fought over at trial. A party who does not respond within 30 days has the matter deemed admitted, and that admission is conclusively established for the case.5Legal Information Institute. Federal Rules of Civil Procedure Rule 36 – Requests for Admission Letting this deadline slip is one of the most expensive calendar mistakes in federal litigation.
Physical and Mental Examinations
When a party’s physical or mental condition is genuinely in dispute, the court can order that person to submit to an exam by a licensed professional. This comes up most in personal injury and disability cases. Unlike other tools, you cannot just serve a request. You need a court order, and the court grants one only if the movant shows good cause and that the condition is actually in controversy.6United States District Court Northern District of Illinois. Federal Rule of Civil Procedure 35 – Physical and Mental Examinations of Persons
Subpoenas to Non-Parties
When the person holding the information is not a party, the tool is a Rule 45 subpoena. A subpoena can compel testimony at a deposition, production of documents or ESI, or inspection of premises.7Legal Information Institute. Federal Rules of Civil Procedure Rule 45 – Subpoena A subpoena can only reach a person within 100 miles of where they live, work, or regularly conduct business in person. A non-party served with a document subpoena can serve written objections before the earlier of the compliance date or 14 days after service, after which the requesting party must negotiate or move to compel. Courts give non-parties more deference on burden than they give parties, so unreasonable subpoenas get narrowed or quashed quickly.
What You Can Keep Back
Attorney-Client Privilege
Confidential communications between you and your lawyer, made for the purpose of giving or receiving legal advice, are shielded.8Legal Information Institute. Federal Rules of Evidence Rule 502 – Attorney-Client Privilege and Work Product; Limitations on Waiver The word doing the work is “confidential.” Copy a third party on an email to your lawyer, or discuss the conversation at dinner, and you may have waived the privilege. It belongs to the client, not the lawyer, and it survives the end of the relationship.
Work-Product Protection
Materials your side prepares in anticipation of litigation, including strategy memos, research notes, and internal assessments, get separate protection under the work-product doctrine.8Legal Information Institute. Federal Rules of Evidence Rule 502 – Attorney-Client Privilege and Work Product; Limitations on Waiver This protection is not absolute. A court can order factual work product disclosed if the other side shows substantial need and no reasonable alternative. Mental impressions and legal theories of a lawyer get the strongest protection and are almost never pried loose.
Trade Secrets and Protective Orders
Physician-patient communications, trade secrets, and proprietary business information can also be shielded, but the protection is not automatic. For commercially sensitive data, a party typically moves for a protective order under Rule 26(c) on a showing of good cause. The court can forbid disclosure, limit who may see the material, require depositions to be sealed, or restrict how confidential information is used.9Legal Information Institute. Federal Rules of Civil Procedure Rule 26 – Section: Protective Orders
The Privilege Log
You cannot withhold a document by simply writing “privileged” on your response. Rule 26(b)(5)(A) requires any party withholding information on privilege or work-product grounds to expressly claim the protection and describe the withheld material in enough detail for the other side to assess the claim, without revealing the protected content.10Legal Information Institute. Federal Rules of Civil Procedure Rule 26 – Section: Claims of Privilege or Protection In practice, that means producing a privilege log listing each withheld item by date, author, recipients, subject, and the specific privilege. Incomplete logs are a common way to lose the protection entirely.
Clawback Orders for Inadvertent Disclosure
In a large production, privileged material sometimes slips through. Federal Rule of Evidence 502(d) lets the court enter an order providing that an inadvertent disclosure in the case does not waive privilege or work-product protection, binding in other federal and state proceedings as well.8Legal Information Institute. Federal Rules of Evidence Rule 502 – Attorney-Client Privilege and Work Product; Limitations on Waiver Parties can also negotiate clawback agreements under Rule 502(e), but a private agreement binds only the signatories. For protection against non-parties arguing waiver, the agreement needs to be entered as a court order. Securing a 502(d) order early is standard in document-heavy cases.
Preserve Everything Before Discovery Starts
The duty to preserve evidence attaches before any request lands. Once litigation is reasonably anticipated, you have to suspend routine document destruction and take affirmative steps to preserve anything that might be relevant. A demand letter, an internal complaint, or a regulatory investigation can all trigger that duty, lawsuit filed or not.
Rule 37(e) sets a sliding scale for lost ESI. If information is lost because a party did not take reasonable steps to preserve it and the loss cannot be fixed through further discovery, the court can order measures no greater than necessary to cure the prejudice. If the court finds the party destroyed the information with intent to deprive the other side of its use, the sanctions get much heavier: a presumption that the lost evidence was unfavorable, an adverse-inference jury instruction, dismissal of the case, or default judgment.11Legal Information Institute. Federal Rules of Civil Procedure Rule 37 – Failure to Make Disclosures or to Cooperate in Discovery; Sanctions Negligent loss is bad. Intentional destruction is where cases end.
What Happens If You Don’t Comply
Discovery obligations are enforceable. When a party ignores a request or refuses to produce without a valid objection, the other side can move to compel under Rule 37. If the court grants the motion and the party still refuses, available sanctions include striking pleadings, barring the party from introducing certain evidence, treating designated facts as established, or dismissing the case.11Legal Information Institute. Federal Rules of Civil Procedure Rule 37 – Failure to Make Disclosures or to Cooperate in Discovery; Sanctions The court must also order the noncompliant party or its lawyer to pay the reasonable expenses, including attorney’s fees, caused by the failure, unless the failure was substantially justified.
Deadlines run throughout. Interrogatories, requests for production, and requests for admission all carry a default 30-day response window.3Legal Information Institute. Federal Rules of Civil Procedure Rule 33 – Interrogatories to Parties2Legal Information Institute. Federal Rules of Civil Procedure Rule 34 – Producing Documents, Electronically Stored Information, and Tangible Things, or Entering onto Land, for Inspection and Other Purposes Missing a request for admission is uniquely punishing because those facts are conclusively admitted.5Legal Information Institute. Federal Rules of Civil Procedure Rule 36 – Requests for Admission
You Have to Update What You Already Produced
Discovery responses are not one and done. Under Rule 26(e), if you learn that a prior disclosure or response was incomplete or incorrect in a material way, you must supplement or correct it in a timely fashion.12Legal Information Institute. Federal Rules of Civil Procedure Rule 26 – Section: Supplementing Disclosures and Responses That duty covers initial disclosures, interrogatory answers, and production responses. For testifying experts, it extends to anything in the report or deposition testimony, with updates due by the time pretrial disclosures are due. Sitting on new information and trying to introduce it at trial is a reliable way to have the evidence excluded.