Discovery questions in a lawsuit are the formal inquiries that opposing parties use before trial to gather facts, lock in testimony, and exchange evidence. They come in four main forms: written interrogatories, requests for production of documents, requests for admission, and oral questions asked during a deposition. In federal court, the process is governed by Rules 26 through 37 and Rule 45 of the Federal Rules of Civil Procedure, and most state courts follow a similar framework. The point is to eliminate surprises so both sides can evaluate the case on the same set of facts, which is also why many lawsuits settle during or shortly after discovery rather than going to trial.
Before the questions start flying, each side has to hand over basic information on its own. Under Rule 26(a), a party must disclose the names and contact information of people likely to have relevant knowledge, along with copies or descriptions of documents and electronically stored information it may use to support its case. These initial disclosures are due within 14 days after the parties’ Rule 26(f) planning conference.1Legal Information Institute. Federal Rules of Civil Procedure Rule 26 – Duty to Disclose; General Provisions Governing Discovery After that, formal discovery questions begin.
Interrogatories: Written Questions Answered Under Oath
Interrogatories are written questions one party sends to another. The receiving party must answer each one separately, in writing, and under oath. In a car accident case, an interrogatory might ask the defendant to describe everything that happened in the minutes before the collision, or to list every medical provider the plaintiff has seen in the last five years.2Legal Information Institute. Federal Rules of Civil Procedure Rule 33 – Interrogatories to Parties
Federal rules cap interrogatories at 25 per party, including subparts, unless the court allows more or the parties agree otherwise.2Legal Information Institute. Federal Rules of Civil Procedure Rule 33 – Interrogatories to Parties That limit matters more than it sounds. Lawyers draft each question carefully because a question with five numbered subparts counts as five interrogatories, not one. State courts set their own limits, which can run higher or lower.
Answers are due within 30 days of service. The court or the parties themselves can adjust that, but 30 days is the default.2Legal Information Institute. Federal Rules of Civil Procedure Rule 33 – Interrogatories to Parties
Requests for Production of Documents
A request for production asks the other side to hand over documents, electronic files, or physical items for inspection and copying. The scope is broad: emails, text messages, photographs, contracts, medical records, financial statements, repair estimates, security footage, and any other tangible material relevant to the dispute.3Legal 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
This is where most of the heavy lifting happens. A single request might ask for “all communications between you and XYZ Corporation regarding the January 2025 contract,” and the responding party has to search its files, email accounts, and cloud storage to produce everything that fits. The 30-day response window applies here as well.
Requests for Admission
Requests for admission work differently from the other tools, and they carry a trap. One party asks the other to admit or deny specific facts or confirm that a document is genuine. The purpose is to narrow what actually needs to be proven at trial.4Legal Information Institute. Federal Rules of Civil Procedure Rule 36 – Requests for Admission
Here is the trap. If you don’t respond within 30 days, every request is automatically treated as admitted. Not “probably admitted” or “presumed admitted pending a hearing.” Admitted, period. Those facts become conclusively established for the rest of the case.4Legal Information Institute. Federal Rules of Civil Procedure Rule 36 – Requests for Admission A court can allow a party to withdraw an admission later, but only if doing so helps decide the case on its merits and doesn’t unfairly prejudice the other side. Getting an admission withdrawn is an uphill fight. Self-represented litigants most often stumble here: they ignore what looks like a routine document, and weeks later discover they’ve conceded the central facts of the case.
Depositions: Oral Questions Under Oath
A deposition is a formal interview where a witness answers questions from the opposing attorney under oath. The witness, called the deponent, can be a party, an employee, an eyewitness, or anyone with relevant knowledge. The testimony carries the same legal weight as courtroom testimony, so a false statement can constitute perjury.5National Institute of Justice. Law 101 Legal Guide for the Forensic Expert – Definition of a Deposition A court reporter administers the oath and creates a word-for-word transcript, and video recording is common.6Legal Information Institute. Deposition
Federal rules limit each side to 10 depositions total, and each deposition is capped at one day of seven hours.7Legal Information Institute. Federal Rules of Civil Procedure Rule 30 – Depositions by Oral Examination The court can extend both limits if the case warrants it. Depositions serve a dual purpose: gathering information and locking a witness into a specific version of events. If the witness says something different at trial, the deposition transcript becomes a tool for cross-examination.
Subpoenas for Non-Parties
Discovery questions aren’t limited to the people suing each other. When a party needs documents or testimony from someone outside the lawsuit, it uses a subpoena under Rule 45. A subpoena can compel a non-party to appear for a deposition, produce documents, or allow inspection of property.8Legal Information Institute. Federal Rules of Civil Procedure Rule 45 – Subpoena
The process has built-in protections. The subpoena generally cannot force someone to travel more than 100 miles from where they live or work. Before serving a subpoena on a non-party, the issuing side must notify all other parties in the case. A person who receives a subpoena can object in writing, typically within 14 days, if compliance would be unreasonably burdensome. The court can quash a subpoena that fails to allow reasonable time to comply, reaches beyond geographic limits, demands privileged material, or imposes undue burden.8Legal Information Institute. Federal Rules of Civil Procedure Rule 45 – Subpoena
What Discovery Questions Can and Cannot Reach
Discovery has a wide reach, but it isn’t unlimited. Three concepts set the boundaries: relevance, proportionality, and privilege.
Relevance and Proportionality
Parties can seek discovery on any nonprivileged matter relevant to any party’s claim or defense. The information doesn’t have to be admissible at trial to be discoverable. Since 2015, that generous standard has been paired with a proportionality requirement in federal court. Discovery must be proportional to the needs of the case, judged by factors spelled out in Rule 26(b)(1): the importance of the issues, the amount in controversy, each side’s relative access to the information, the parties’ resources, how important the discovery is to resolving the case, and whether the burden outweighs the benefit.1Legal Information Institute. Federal Rules of Civil Procedure Rule 26 – Duty to Disclose; General Provisions Governing Discovery Proportionality gives judges a tool to rein in requests that technically ask for relevant material but would cost a fortune to produce for marginal benefit.
Privilege and Work Product
Even relevant, proportional information can be shielded if it’s privileged. The most familiar example is attorney-client privilege, which protects confidential communications between a lawyer and client made for the purpose of giving or getting legal advice. Other privileges include spousal communications and the right against self-incrimination.9Legal Information Institute. Privilege
Closely related is the work-product doctrine, which protects documents and materials prepared in anticipation of litigation. An attorney’s strategy notes, internal memos weighing arguments, and draft reports prepared for the case are shielded. Unlike attorney-client privilege, work-product protection can extend to materials prepared by people other than the attorney, as long as they were created to prepare for the case.1Legal Information Institute. Federal Rules of Civil Procedure Rule 26 – Duty to Disclose; General Provisions Governing Discovery
A party withholding information on privilege or work-product grounds can’t just stay silent. Under Rule 26(b)(5), the party must expressly claim the protection and describe the withheld material in enough detail for the other side to evaluate the claim. This description, commonly called a privilege log, must identify the nature of the document without revealing the protected content.1Legal Information Institute. Federal Rules of Civil Procedure Rule 26 – Duty to Disclose; General Provisions Governing Discovery
Objecting to Discovery Questions
Not every question deserves a full response. A party can object to specific requests on several grounds:
- Irrelevance, where the request has no connection to the claims or defenses.
- Overbreadth or undue burden, where complying would be unreasonably expensive or time-consuming relative to the value.
- Vagueness, where the request is too ambiguous to answer meaningfully.
- Privilege or work product, where the request targets protected communications or litigation preparation.
- Calls for a legal conclusion, where the request asks for a legal opinion rather than facts.
Objections must be specific. A blanket “objection: overly broad and unduly burdensome” without any explanation will rarely survive scrutiny. Courts expect the objecting party to explain why the request crosses the line and, when the objection applies only to part of a request, to answer the rest. An objection that stalls without legitimate basis can itself trigger sanctions.
Deadlines and the Cost of Not Responding
Discovery has teeth. The default response deadline for interrogatories, requests for production, and requests for admission is 30 days after service.2Legal Information Institute. Federal Rules of Civil Procedure Rule 33 – Interrogatories to Parties For admissions, silence equals admission.4Legal Information Institute. Federal Rules of Civil Procedure Rule 36 – Requests for Admission
Evasive or incomplete responses are treated the same as no response at all. If a party refuses to cooperate, the requesting side can file a motion to compel, asking the judge to order compliance. Before filing, the moving party must certify that it tried in good faith to resolve the dispute without involving the court.10Legal Information Institute. Federal Rules of Civil Procedure Rule 37 – Failure to Make Disclosures or to Cooperate in Discovery; Sanctions
If the court grants the motion and the non-compliant party still doesn’t cooperate, Rule 37(b)(2) authorizes a range of sanctions:
- Monetary penalties, including payment of the other side’s reasonable expenses and attorney’s fees.
- Adverse inference, directing the jury to treat certain facts as established against the non-compliant party.
- Barring the party from supporting or opposing specific claims or defenses.
- Striking pleadings, in whole or in part.
- Default judgment against the non-compliant party or dismissal of its claims, in the most serious cases.
Courts impose these sanctions regularly, especially when a party has been warned and continues to stonewall.10Legal Information Institute. Federal Rules of Civil Procedure Rule 37 – Failure to Make Disclosures or to Cooperate in Discovery; Sanctions
Separately, providing false information under oath in discovery responses or at a deposition can lead to criminal prosecution for perjury, which carries a federal penalty of up to five years in prison.11Office of the Law Revision Counsel. 18 USC 1621 – Perjury Generally
Preserving Evidence Before the Questions Arrive
The duty to preserve evidence attaches before any discovery request arrives. Once a party reasonably anticipates litigation, it must take affirmative steps to prevent destruction of relevant documents and data. In practice, this means issuing a litigation hold, a formal internal directive to stop routine deletion of emails, texts, voicemails, and electronic records that might be relevant.
Destroying, hiding, or failing to preserve evidence after the duty attaches is called spoliation. Under Rule 37(e), when electronically stored information that should have been preserved is lost because a party failed to take reasonable steps, the court can order measures no greater than necessary to cure the prejudice. If the party acted with intent to deprive the other side of the information, the court may presume the lost data was unfavorable, instruct the jury accordingly, or dismiss the action.10Legal Information Institute. Federal Rules of Civil Procedure Rule 37 – Failure to Make Disclosures or to Cooperate in Discovery; Sanctions
The practical takeaway: the moment a lawsuit looks likely, stop deleting anything that might be relevant, and tell anyone with potentially relevant files to do the same. Spoliation is one of the fastest ways to turn a defensible case into a losing one.