Interrogatories are the workhorse of written discovery. They are inexpensive, they can be drafted with care, and they force an opponent to commit, in writing and under oath, to a version of the facts. Yet their apparent simplicity conceals a dense body of rules and tactics. A clumsy interrogatory wastes one of only twenty-five questions a party may ordinarily ask. A clumsy response waives objections, invites a motion to compel, or — worse — locks a client into an admission that surfaces at summary judgment or trial. This guide walks through the entire life cycle of an interrogatory under Federal Rule of Civil Procedure 33, from the numerical limit and the counting of discrete subparts, through scope and proportionality, the option to produce business records, verification, objections after the 2015 amendments, the duty to supplement, and the motion-to-compel and sanctions machinery that backs it all up. It also covers the front end that many guides skip: how to draft definitions, instructions, and the interrogatories themselves so that they survive objection and actually pry loose useful information. The article is written so that a judge, a litigator, and a non-lawyer party can each follow it, and it is salted with example interrogatories and model responses you can adapt.

This article is part of a broader discovery series at mclaw.io. For the document-production analogue, see Mastering Document Discovery; for requests for admission, see Strategic Responses to Requests for Admission; for depositions, see The Art and Science of Depositions; and for the discovery system as a whole, see A Practical Discovery Refresher. Litigants new to the federal system may also want A Comprehensive Guide to Federal Civil Litigation for Small Businesses and Evaluating and Assessing a Civil Case for the larger picture into which discovery fits.

What an Interrogatory Is — and Why It Matters

An interrogatory is a written question that one party in a lawsuit serves on another party, which that party must answer in writing and under oath. The word comes from the Latin interrogare, to question. Unlike a deposition, where a witness answers spoken questions in real time, an interrogatory gives the responding party time — ordinarily thirty days — to investigate, consult counsel, and compose a careful written answer. Unlike a request for production, which calls for documents, an interrogatory calls for a sworn narrative or list. And unlike informal correspondence between lawyers, an interrogatory is a formal discovery device governed by Federal Rule of Civil Procedure 33 (and parallel state rules), backed by the coercive power of the court.

Interrogatories serve several distinct purposes in a case. They elicit and gather relevant facts. They identify the individuals and entities who possess knowledge of those facts — the people you will later depose. They locate and describe documents and communications. They pin down an opponent's contentions: the specific facts and legal theories the other side intends to rely on for its claims, defenses, and damages. And they generate sworn answers that can be used later — to impeach a witness whose trial testimony contradicts the written answer, as an evidentiary admission, or as leverage in a motion for summary judgment, in mediation, or in settlement talks. Because the answer is verified under oath, an interrogatory response is a commitment, not a casual statement. That is precisely what makes the device powerful and what makes responding to one a task that rewards discipline.

To make the discussion concrete, we will use an invented dispute throughout. The following scenario is hypothetical. Imagine that Acme Corp. sues its former supplier, Borealis Industries, LLC, alleging that Borealis breached a supply contract by shipping defective components, and that the defects caused a product recall. Borealis denies breach and counterclaims for unpaid invoices. The amount in controversy is roughly $1.2 million. The parties will exchange interrogatories as their case develops, and we will draft and answer several of them as we go.

The Governing Framework: Rule 33 and Its Neighbors

Rule 33 is the home statute, but it does not stand alone. Three rules work together to define what an interrogatory may ask, who must answer, and what happens if a party balks.

Rule 33 itself sets the mechanics: who may serve interrogatories and on whom, the presumptive limit of twenty-five questions, the thirty-day clock, the requirement that answers be given separately, fully, in writing, and under oath, the requirement that objections be stated with specificity, the express authorization of contention interrogatories, and the option to answer by producing business records.

Rule 26(b)(1) supplies the scope of discovery. Interrogatories may seek only matter that is "relevant to any party's claim or defense and proportional to the needs of the case." This is the master standard, and it is imported wholesale into interrogatory practice. We discuss it in detail below.

Rule 26(g) imposes a certification duty. When a lawyer signs a discovery response, the signature certifies that, after a reasonable inquiry, the response is complete and correct, is consistent with the rules, is not interposed for any improper purpose, and is neither unreasonable nor unduly burdensome. A violation can trigger sanctions independent of any motion to compel.

Rule 37 supplies the enforcement mechanism: the motion to compel, the cost-shifting presumption, and the ladder of sanctions for noncompliance.

Two cautions apply at the threshold. First, only parties may use interrogatories, and interrogatories may be directed only to other parties. A nonparty cannot be served with interrogatories and cannot be compelled to answer them (Ward v. Empire Vision Centers, Inc., 262 F.R.D. 256, 261 (W.D.N.Y. 2009)). To get written answers from a nonparty witness, a party must use a deposition by written question under Rule 31 — the functional equivalent of interrogatories for nonparties — although in practice lawyers nearly always prefer an oral deposition under Rule 30 because of its flexibility and the chance to follow up in real time. Second, local rules and a judge's individual practices routinely modify Rule 33. Many districts impose uniform definitions that every discovery request must use, dictate formatting (for instance, requiring that the full text of each interrogatory be restated before each answer), set a different numerical limit, or restrict when contention interrogatories may be served. Before drafting or responding, counsel must read the district's local civil rules, the assigned judge's individual rules, and any case-specific scheduling or discovery order. If interrogatories do not conform to the applicable rules, a court may rule that the responding party need not answer them at all.

When Interrogatories May Be Served

A party generally may not serve interrogatories until after the parties have held their Rule 26(f) conference — the early "meet and confer" at which they discuss the nature of the case and frame a discovery plan. Once that conference has occurred, interrogatories may be served at any time during the discovery period, provided they are served early enough to give the responding party its full response time (ordinarily thirty days) before the discovery cutoff. Serving interrogatories on the last day of discovery is not just bad form; it effectively deprives the other side of the response window. Courts will not enforce discovery requests that call for responses after the cutoff and have stricken interrogatories served "so late in the game" that the adversary had no time to respond (Thomas v. Pacificorp, 324 F.3d 1176, 1179 (10th Cir. 2003); Yangming Marine Transport Corp. v. Foremost International, Inc., 1988 WL 100192, at *1 (S.D.N.Y. Sept. 16, 1988)).

The timing of what you ask is a strategic decision in its own right. Because the supply of interrogatories is capped, experienced counsel often serve a first set early to identify witnesses and locate documents, then hold back several questions for later in the case — for targeted contention interrogatories once other discovery has revealed the opponent's factual allegations, or to follow up on a question raised by a produced document (for example, "Who wrote the handwritten annotation on the document Bates-stamped BOREALIS-004217?"). The discovery tools are meant to work in concert; for a broader view of how interrogatories, document requests, admissions, and depositions fit together, see A Practical Discovery Refresher.

The Numerical Limit: Twenty-Five, Including Discrete Subparts

Rule 33(a)(1) limits a party to serving "no more than 25 written interrogatories, including all discrete subparts," on any other party, unless the court orders otherwise or the parties stipulate to a different number. Two features of this rule trip up the unwary.

First, the limit is per party, and it is cumulative across the action. If Acme sues three defendants, Acme may serve up to twenty-five interrogatories on each of the three, for a maximum of seventy-five — but it may not serve a single defendant with a first set of fifteen and a later set of twenty and expect all thirty-five to be answered. Once a party has used its twenty-five against a given opponent, it is out, absent agreement or leave of court. Courts will ordinarily grant leave to serve additional interrogatories when doing so is consistent with the Rule 26(b)(1) and 26(b)(2) limits — that is, when the additional questions are not unreasonably cumulative or duplicative, when the information is not more easily obtained elsewhere, when the requesting party has not already had ample opportunity to get it, and when the discovery falls within the proportional scope of Rule 26(b)(1). But leave is not automatic, and a party that blows through the limit without permission will generally not be able to compel answers to the excess (Walker v. Lakewood Condominium Owners Ass'n, 186 F.R.D. 584, 586–89 (C.D. Cal. 1999)).

Second — and this is where careful drafting earns its keep — the limit counts "all discrete subparts." An interrogatory cannot evade the cap by smuggling four separate questions into one numbered paragraph with subparts (a) through (d). But not every subpart counts as a separate interrogatory. The governing test, drawn from the 1993 Advisory Committee Note and a consistent body of case law, asks whether a subpart introduces a "discrete" or "distinct line of inquiry" or is instead "logically or factually subsumed within" and "necessarily related to" the primary question. If the subparts are logically related to a common primary question, they count as one. If a subpart launches a new and separate inquiry, it counts as another interrogatory.

The classic illustration concerns communications. Suppose Acme serves this interrogatory:

Interrogatory No. 4: For each communication between Borealis and Acme concerning the quality of the components supplied under the Supply Agreement, identify (a) the date of the communication, (b) the participants, (c) the medium (oral, email, letter, or other), and (d) the substance of what was said.

Subparts (a) through (d) all elaborate the single concept of "each communication." They are the details — when, who, how, what — that flesh out the identification of a communication. Courts will generally treat this as one interrogatory (Superior Communications v. Earhugger, Inc., 257 F.R.D. 215, 218 (C.D. Cal. 2009); 1993 Advisory Committee Note to Rule 33(a)). Now add:

...and (e) describe all actions Borealis took in response to each such communication.

Subpart (e) is a different beast. Asking what actions a party took in response to a communication is a new line of inquiry, not subsumed within the act of identifying the communication itself. A court will likely count it as a separate interrogatory (Theobles v. Industrial Maintenance Co., 247 F.R.D. 483, 487 (D.V.I. 2006)). Where subparts each open a genuinely distinct topic, courts count each one (Thermal Design, Inc. v. Guardian Building Products, Inc., 2011 WL 1527025, at *2–3 (E.D. Wis. Apr. 20, 2011) (counting subparts separately because each introduced a distinct line of inquiry and none was factually subsumed within the prior question)).

The practical lesson for the drafter is to think hard about subparts before serving. A single interrogatory loaded with discrete subparts can quietly consume the entire allotment and leave the responding party with a meritorious objection that the set exceeds the limit. The practical lesson for the responder is to count carefully: if the propounding party's "twenty interrogatories" actually contain thirty-two discrete subparts, the responder has a legitimate objection to everything past number twenty-five (after a good-faith meet and confer about which questions count). Drafting discipline on subparts is, in effect, a budget discipline. The same arithmetic applies to a party's overall discovery plan: see A Practical Discovery Refresher for how to allocate questions across the case.

Scope and Proportionality: What May Be Asked

Rule 33(a)(2) permits an interrogatory to relate to "any matter that may be inquired into under Rule 26(b)." That cross-reference is everything. Under Rule 26(b)(1) as amended in 2015, a party may obtain discovery of any matter that is (1) nonprivileged, (2) relevant to any party's claim or defense, and (3) proportional to the needs of the case.

The 2015 amendments changed the rhetoric of relevance in a way that matters when you write and object. The old formulation allowed discovery of anything "reasonably calculated to lead to the discovery of admissible evidence." That phrase is now gone from the operative text of Rule 26(b)(1) — it survives only as a description of the rule that information need not be admissible to be discoverable. Courts after 2015 have overruled objections that recite the dead phrase and have likewise rejected the once-common objection that an interrogatory is "not relevant to the subject matter of the action." The benchmark is relevance "to any party's claim or defense," and the propounding party who wants to defend a request — or the responding party who wants to attack one — should frame the argument in those terms.

Even relevant information is discoverable only if it is proportional. Proportionality is not a single factor but a weighing of six considerations enumerated in Rule 26(b)(1): the importance of the issues at stake in the action, the amount in controversy, the parties' relative access to relevant information, the parties' resources, the importance of the discovery in resolving the issues, and whether the burden or expense of the proposed discovery outweighs its likely benefit. No factor is decisive; courts balance them all together. But in practice the cost-and-burden factor often becomes the threshold inquiry, with the other factors coloring the analysis — courts frequently weigh the amount in controversy against the cost of the discovery and reject requests whose expense outruns the stakes. A sprawling interrogatory in a small-stakes contract case will fare worse than the same question in a bet-the-company dispute. An interrogatory directed at information equally available to both sides — or that the asking party could obtain more cheaply through its own records — is vulnerable. So is one that seeks information of only marginal evidentiary value, such as a sweep of an entire email account when targeted, search-term productions have already captured what is relevant (Russell v. Kiewit Corp., 2019 WL 2357525, at *3 (D. Kan. June 4, 2019)).

Proportionality is now a substantive objection, not a slogan, and the law allocates the burden of supporting it with precision. Because the responding party is in the best position to assess what compliance would cost, that party bears the initial burden of demonstrating disproportionality with concrete figures — custodians, document volume, review hours, dollar estimates (State Farm Mutual Automobile Insurance Co. v. Pointe Physical Therapy, LLC, 255 F. Supp. 3d 700, 705 (E.D. Mich. 2017); Michelo v. National Collegiate Student Loan Trust 2007-2, 2020 WL 9423921, at *5 (S.D.N.Y. Aug. 31, 2020)). A bare assertion that responding would be "burdensome" carries no weight; the objector must show its work. Conversely, the requesting party should come armed with reasons the information matters and with proposals to cut the burden. Proportionality also has a public dimension that monetary stakes do not capture: in cases implicating important public policy — employment practices, civil rights, free speech — courts have long recognized that the value of discovery "may have importance far beyond the monetary amount involved" (Rule 26(b)(1) Advisory Committee Note to 1983 amendment), and they grant broader discovery accordingly (Oxbow Carbon & Minerals LLC v. Union Pacific Railroad Co., 322 F.R.D. 1, 7 (D.D.C. 2017)). Finally, proportionality is not all-or-nothing. When a request is too broad as written but seeks something legitimate, the modern remedy is often a tailored one — phasing discovery to start with the most accessible, least expensive sources, narrowing the time frame, or limiting custodians — rather than a flat refusal. For a deeper treatment of how to assert and rebut these objections, see Making and Responding to Proportionality Objections and the discovery-scope discussion in A Practical Discovery Refresher.

What kinds of information are interrogatories good at extracting? They excel at identification: the names, locations, and contact information of people with knowledge; the existence, description, and custody of documents; whether and when communications occurred and who took part; the basis and methodology behind a damages calculation; and the identity of those who helped prepare the answers. They are well suited to facts that can be stated discretely in writing — dates, amounts, sequences, lists. They are less suited to nuanced narrative, credibility-laden testimony, or matters that beg for immediate follow-up; for those, a deposition is the better tool, because the element of surprise, the ability to gauge credibility, and the freedom to ask the next question all favor live examination (see The Art and Science of Depositions).

One discipline saves interrogatories from waste: do not use them to ask for information the rules already require an opponent to disclose. Rule 26(a)(1) compels each party, without any request, to disclose the identity and contact information of witnesses it may use to support its claims or defenses, a description of the documents it may use, and a computation of each category of damages; Rule 26(a)(2) requires expert disclosures on a separate schedule. Burning interrogatories to ask for that material squanders the limited supply. The smarter use is to reach beyond the automatic disclosures — for the adverse witnesses and unfavorable documents a party would never volunteer because it does not intend to rely on them, and for the assumptions and methodology lurking behind a bare damages number.

Contention Interrogatories and Their Timing

Rule 33(a)(2) expressly authorizes a particular and powerful species: the contention interrogatory. A contention interrogatory asks a party to state the facts on which it bases a specific claim or defense, or to articulate how it contends the law applies to the facts of the case. "An interrogatory is not objectionable merely because it asks for an opinion or contention that relates to fact or the application of law to fact," the rule provides. So a question like the following is proper:

Interrogatory No. 9: State all facts that support Your contention, asserted in Paragraph 14 of the Complaint, that the components Borealis supplied were "defective," including for each fact the identity of every person with knowledge of it and the identity of every document that evidences it.

Contention interrogatories do real work. They define the issues for trial by forcing the opponent to commit to a theory, and they let the propounding party gather the proof needed to rebut that theory. Practitioners typically use them to obtain or clarify the factual basis for an opponent's claims, defenses, or allegations and the application of law to those facts (Steil v. Humana Kansas City, Inc., 197 F.R.D. 445, 447 (D. Kan. 2000)). They are the written-discovery cousin of the request for admission, which is used to narrow uncontested issues rather than to develop them (see Strategic Responses to Requests for Admission).

But Rule 33(a)(2) attaches a crucial qualifier to timing: "the court may order that the interrogatory need not be answered until designated discovery is complete, or until a pretrial conference or some other time." The rationale is fairness and efficiency. Asked at the outset of a case, a contention interrogatory demands that a party marshal "all facts" before it has had the chance to take discovery — an unrealistic burden that produces either an empty answer ("investigation continues") or one that the party must amend repeatedly. Courts therefore frequently defer contention interrogatories to the close of fact discovery (Nestle Foods Corp. v. Aetna Casualty & Surety Co., 135 F.R.D. 101, 110–11 (D.N.J. 1990)). Some districts codify the practice: in the Southern and Eastern Districts of New York, Local Civil Rule 33.3 generally bars interrogatories seeking an adversary's claims and contentions until the conclusion of other discovery, except in narrow circumstances. The lesson is twofold. If you are propounding, hold your contention interrogatories for late in the case, after documents and depositions have exposed the opponent's position. If you are responding too early, consider an objection that the contention interrogatory is premature — though be aware that some courts do not treat prematurity as a valid objection and will require a present answer subject to supplementation (Remy Inc. v. Tecnomatic, S.P.A., 2013 WL 1183334, at *1 (S.D. Ind. Mar. 21, 2013)). Always check the local rules before relying on prematurity. The same family of contention-style requests appears in specialized contexts, too — for instance, in Trademark Trial and Appeal Board practice, where interrogatories are a central tool (see Discovery Practice in TTAB Trademark Proceedings).

The Option to Produce Business Records: Rule 33(d)

Rule 33(d) gives the responding party an alternative to writing out a laborious narrative answer. If the answer to an interrogatory can be derived from the party's business records — by examining, auditing, compiling, abstracting, or summarizing them — and if "the burden of deriving or ascertaining the answer will be substantially the same for either party," the responding party may answer by specifying the records in sufficient detail to let the asking party locate and identify them as readily as the responding party could, and by giving the asking party a reasonable opportunity to examine and copy them.

This option is most useful for interrogatories that essentially ask for a tabulation — "State the quantity and unit price of every component Borealis shipped to Acme under the Supply Agreement between January 2023 and December 2024." If the answer lives in invoices and shipping records, Rule 33(d) lets Borealis point Acme to those records rather than transcribe them.

But Rule 33(d) has teeth and limits. The "substantially the same burden" requirement is real: the option is available only where the asking party can derive the answer about as easily as the responding party. Courts assess this by looking at the responding party's familiarity with its own files, the cost of research needed to locate the answer, and the nature of the records (United States v. Kellogg Brown & Root Services, Inc., 284 F.R.D. 22, 30 (D.D.C. 2012)). Where the responding party knows its own documents intimately and the asking party would have to wade through a haystack, the burden is not equal, and the answer must be written out. Three further constraints apply. The responding party must affirmatively state that it is electing the Rule 33(d) option — silently producing documents is not enough. It must specify the records with particularity; a blanket reference to "documents already produced" or to a mountain of files is insufficient and will be rejected (VeroBlue Farms USA Inc. v. Wulf, 2021 WL 5176839, at *27–28 (N.D. Tex. Nov. 8, 2021); Mullins v. Prudential Insurance Co. of America, 267 F.R.D. 504, 514–15 (W.D. Ky. 2010)). And it must produce an index, or otherwise guide the asking party to the responsive material, when the production is voluminous (Rule 33(d)(1)–(2)). Rule 33(d) is not a license for a fishing expedition or a way to dodge an answer; the responding party may invoke it only when it actually knows the records contain the responsive information. Here is what a proper invocation looks like:

Response to Interrogatory No. 6: Pursuant to Federal Rule of Civil Procedure 33(d), Borealis elects to answer this Interrogatory by producing business records from which the answer may be derived, the burden of deriving the answer being substantially the same for either party. The responsive information is contained in the monthly shipping ledgers produced at BOREALIS-002001 through BOREALIS-002388 and the corresponding invoices produced at BOREALIS-003001 through BOREALIS-003590. An index correlating each shipment to its invoice is produced at BOREALIS-002000. Borealis will make the originals available for inspection and copying at its offices upon reasonable notice.

A caution about scope: Rule 33(d) is a way to answer an interrogatory, not a way to obtain documents. Counsel should not use interrogatories as a substitute for a Rule 34 document request; the proper device for getting documents from a party is a request for production (Terracon Consultants, Inc. v. Drash, 2013 WL 1633572, at *3 (D. Kan. Apr. 16, 2013)). Because Rule 33(d) leans on the same business records that requests for production target, coordinating the two devices avoids duplication and inconsistency; see Mastering Document Discovery.

Verification: Answering Under Oath

The signature that gives an interrogatory answer its evidentiary weight is the verification. Rule 33(b)(3) requires that the person who answers each interrogatory must sign it, and Rule 33(b)(5) requires that the answering person attest to its truth — the answers must be given under oath. Objections are signed by the attorney; the answers are verified by the party. This split matters: a verification signed only by counsel, with no party attestation to the substance, does not satisfy Rule 33. In practice the verification is a separate page signed and attached after the written answers (and after counsel's objections, if any) are finalized.

For an individual party, the individual must sign and verify the answers. For an entity — a corporation, partnership, association, or government agency — Rule 33(b)(1)(B) requires the entity to designate "any officer or agent" to answer and verify on the entity's behalf. The designated representative need not have personal knowledge of every fact in the answers (Jiminez-Carillo v. Autopart International, Inc., 285 F.R.D. 668, 669 (S.D. Fla. 2012)). In a large organization, no single person could. What the representative must do is gather all responsive information reasonably available to the entity — by interviewing employees and agents and by searching the company's records — and then verify the answers on the basis of that collected information and belief (Shepherd v. American Broadcasting Cos., 62 F.3d 1469, 1482 (D.C. Cir. 1995)). The duty to collect is the entity's; the representative is its instrument.

The under-oath requirement is satisfied in one of two conventional ways: a sworn statement that the party signs before a notary, or — far more common in federal practice — an unsworn declaration under penalty of perjury pursuant to 28 U.S.C. § 1746, which requires no notarization. A model individual verification reads:

I, Dana Rivera, have read Acme Corp.'s First Set of Interrogatories and my answers to those interrogatories. My answers are true to the best of my knowledge, information, and belief. I declare under penalty of perjury under the laws of the United States of America that the foregoing is true and correct. Executed on [date].

A corporate verification names the representative and her authority to answer for the entity — for example: "I, Lena Ostrowski, am the Vice President of Operations of Borealis Industries, LLC, and am authorized to make this verification on its behalf. The foregoing answers were prepared with the assistance of counsel and are based on information collected from Borealis's records and personnel. I declare under penalty of perjury under the laws of the United States that they are true and correct to the best of my knowledge, information, and belief." Two wrinkles deserve attention. First, the basis of the verification — whether it may rest on "information and belief" or must rest on personal knowledge — varies by court for individuals. Most courts accept an individual verification made in part on information and belief; some insist that an individual verify only on personal knowledge and have held that, unlike a corporate representative, an individual may not verify even in part on information and belief (compare the more permissive cases with United States ex rel. O'Connell v. Chapman University, 245 F.R.D. 646, 650 (C.D. Cal. 2007)). A corporate representative, by contrast, is generally permitted — indeed expected — to verify on information and belief gathered from the company. Second, if the verifying individual is located outside the United States, the § 1746 declaration must use the specific statutory language for foreign execution (28 U.S.C. § 1746(1)). Read § 1746 and the local cases before finalizing a verification; a defective verification can render the answers unsworn and expose the party to a motion to compel a proper response.

Drafting Interrogatories That Work: Definitions, Instructions, and Form

A great deal of friction in interrogatory practice is self-inflicted at the drafting stage, and a few front-end disciplines pay for themselves many times over. A well-built set of interrogatories has three components beyond the questions themselves: a definitions section, an instructions section, and questions written with enough precision to be answerable but enough reach to be useful.

Definitions convert recurring concepts into defined terms so the questions stay short and the meaning stays fixed. Good definitions are precise without being oppressive. A workable convention for "identify," for example, tells the responding party exactly what to provide: as to a person, the full name, last known address, telephone number, and employer; as to a document, the type, general subject matter, date, and the author, addressee, and recipients (with an express alternative that the responding party may instead produce the document with identifying information sufficient to satisfy Rule 33). Defining "communication," "document" (tracking Rule 34's broad ESI definition), "the Supply Agreement," and "the relevant period" once, at the top, lets every later question incorporate them by reference. Beware the temptation to define terms so expansively that they create burden the propounding party did not intend — a definition of "concerning" that sweeps in anything "referring or relating in any way, directly or indirectly," is a classic invitation to an overbreadth objection.

Instructions set ground rules: that the interrogatories are continuing in nature and must be supplemented as Rule 26(e) requires; that if the responding party objects on privilege or confidentiality grounds it must provide the information Rule 26(b)(5) demands (i.e., a privilege log); and that an objection to part of an interrogatory does not excuse answering the rest. Instructions must conform to local and individual rules and must not purport to impose obligations the rules do not — an instruction commanding the responding party to answer "regardless of any objection," for instance, is improper and invites its own objection.

The questions should be drafted to a sharp point. Compare a question that asks the opponent to "describe everything about the components" — vague, overbroad, and unanswerable — with one that asks the opponent to "identify each lot of components shipped to Acme between June 1 and September 30, 2024, and for each lot state the date of shipment, the quantity, and the results of any quality-control testing." The second question tells the responder precisely what to do and is far harder to evade. Where a topic is sensitive or prone to overbreadth disputes — social media and online activity are the modern example — tie the request to a specific, relevant time period or to a particular contention rather than demanding a party's entire online footprint. Courts are often hesitant to enforce sweeping social-media interrogatories untethered from the issues in the case, so a narrowly framed request ("identify any social media post You made between January and March 2025 concerning the recall") is both more likely to be enforced and less likely to draw a fight. Finally, restate any required formatting — many districts require the full text of each interrogatory to be reproduced before the answer — and include a blank verification form at the end as a courtesy and a reminder that the answers must be verified.

Stating Objections With Specificity: Life After Boilerplate

For decades, interrogatory responses opened with a wall of "General Objections" — a recitation that the requests were "overly broad, unduly burdensome, vague, ambiguous, oppressive, and not reasonably calculated to lead to the discovery of admissible evidence" — incorporated by reference into every specific answer. The 2015 amendments, together with a growing body of frustrated judicial opinion, declared war on this practice, and the modern responder must abandon it.

Rule 33(b)(4) requires that "[t]he grounds for objecting to an interrogatory must be stated with specificity." A boilerplate objection — one that recites legal labels without explaining how or why they apply to the particular question — does not state grounds with specificity. Courts increasingly disregard or strike such objections, treat them as waived, and in egregious cases impose sanctions (Heller v. City of Dallas, 303 F.R.D. 466, 483–84 (N.D. Tex. 2014)). The 2015 amendment to Rule 34, which the courts read across to Rule 33, also requires that an objection state whether any responsive material is being withheld on the basis of the objection — eliminating the maddening uncertainty of a response that objects and then says nothing about whether anything was actually withheld.

The discipline this imposes is straightforward to state and harder to practice: tie each objection to the specific question and explain the basis. Instead of "Objection, overbroad and unduly burdensome," write what makes this interrogatory overbroad (it seeks "all" communications without temporal or subject-matter limit) and what makes it burdensome (it would require reviewing eight years of email across twelve custodians at an estimated cost of $X). Where part of an interrogatory is objectionable and part is not, Rule 33 and the 1993 Advisory Committee Note require the responder to object to the offending part, specify which part is objectionable, and answer the rest. A blanket refusal to answer because some sliver of the question is objectionable is itself improper and many local rules forbid it.

Two further points on the mechanics. First, objections must be timely. Rule 33(b)(2) requires answers and objections within thirty days; Rule 33(b)(4) provides that "[a]ny ground not stated in a timely objection is waived unless the court, for good cause, excuses the failure." A late objection is presumptively gone (National Fire Insurance Co. of Hartford v. Jose Trucking Corp., 264 F.R.D. 233, 238 (W.D.N.C. 2010)), though courts retain discretion to excuse the waiver for good cause (Cheshire v. Air Methods Corp., 2015 WL 7736649, at *3 (W.D. La. Nov. 30, 2015)). Second, there is still a legitimate role for a short "General Objections" section — but only for genuine, specific objections that truly apply across the board, such as an objection to a defined term, to an instruction that purports to impose obligations beyond the rules, or to the set exceeding the twenty-five-interrogatory limit. Even there, each general objection must articulate a specific basis. A general-objections section is not a place to hedge; it is a place to make a small number of real, particularized objections that genuinely span the set.

Common Objections, With Model Language

The following are the objections that recur in interrogatory practice, each paired with model language that states the ground with the specificity Rule 33 now demands. The art lies in marrying a valid legal ground to the concrete facts of the question — and, wherever possible, answering the unobjectionable remainder.

Relevance. The information must relate to a claim or defense. After 2015, frame the objection in those terms and avoid the obsolete "subject matter" and "reasonably calculated" formulations, which courts overrule.

Objection. This Interrogatory seeks information about Borealis's sales to customers other than Acme. Those sales are not relevant to any claim or defense in this action, which concerns only the components supplied to Acme under the Supply Agreement and the alleged recall.

Overbreadth. Aimed at "all," "any," and "each and every" requests untethered from a sensible time frame, set of actors, or subject. The key is to show the request reaches beyond what relevance permits.

Objection. This Interrogatory, which seeks "all communications concerning the parties' business relationship" without any time limitation, is overbroad. The Supply Agreement was executed in January 2023, and the relevant period extends through the recall in March 2025. Subject to and without waiving this objection, Borealis will answer as to communications between January 2023 and March 2025.

Proportionality / undue burden. After 2015 this is a substantive objection that must be supported with facts about the actual burden, not a slogan. State the number of custodians, the volume of material, the cost, and why the burden outweighs the benefit given the stakes. Because the responding party bears the initial burden of showing disproportionality, the objection must show its work.

Objection. This Interrogatory asks Borealis to "identify and describe every internal communication" relating to component quality over a five-year period. Responding would require collecting and reviewing the email of fourteen custodians spanning approximately 2.3 million documents, at an estimated review cost exceeding $400,000 — disproportionate to the needs of this case under Rule 26(b)(1) given the $1.2 million amount in controversy. Borealis will produce the quality-control reports for the components at issue, which contain the substance of the responsive information at a fraction of the burden, and is willing to discuss a phased approach beginning with the three custodians most likely to possess responsive material.

Vagueness and ambiguity. Identify the specific undefined term and explain why it prevents a meaningful answer; do not assert generic vagueness.

Objection. The term "agreements" is ambiguous because it is undefined and may refer to written contracts, oral understandings, course-of-dealing arrangements, or informal commitments. Subject to and without waiving this objection, and construing "agreements" to mean written contracts between the parties, Borealis responds as follows: [answer].

Privilege. Attorney-client privilege protects confidential communications between client and counsel made to obtain or give legal advice; the work-product doctrine, codified in Rule 26(b)(3), protects materials prepared in anticipation of litigation. Neither protects the underlying facts. A party cannot refuse to state what happened merely because it also discussed those events with its lawyer. When privileged matter is withheld, Rule 26(b)(5) requires a privilege log describing the withheld material in enough detail to let the asking party assess the claim without revealing the protected content.

Objection. To the extent this Interrogatory seeks the substance of communications between Borealis and its counsel concerning the recall, it calls for information protected by the attorney-client privilege and the work-product doctrine. Borealis will provide a privilege log identifying any responsive communication withheld on this basis. Subject to and without waiving these protections, Borealis states the underlying facts as follows: [answer the facts].

Calls for a legal conclusion. An interrogatory may not demand a pure legal opinion divorced from the facts — but note that Rule 33(a)(2) expressly permits questions seeking an opinion or contention that applies law to fact. The line is between "State your legal theory of res judicata generally" (objectionable) and "State the facts supporting your contention that the components were defective" (a proper contention interrogatory).

Premature contention interrogatory. As discussed above, where local rules or fairness counsel deferral.

Objection. This Interrogatory is a contention interrogatory asking Borealis to state "all facts" supporting an affirmative defense at the outset of discovery, before document production and depositions. Pursuant to Rule 33(a)(2), Borealis objects that the Interrogatory is premature and will respond at the close of fact discovery, supplementing as required by Rule 26(e).

Exceeds the numerical limit. Where the set, counting discrete subparts, runs past twenty-five.

Objection. Including discrete subparts, Acme's First Set of Interrogatories contains thirty-one interrogatories, exceeding the limit of twenty-five under Rule 33(a)(1). Borealis will answer Interrogatories Nos. 1 through 25 and objects to Nos. 26 through 31 as exceeding the limit absent a stipulation or court order.

A final caution: do not object that an interrogatory is improper merely because the asking party already knows the answer or already possesses the responsive information. That is not a valid objection (VeroBlue Farms, 2021 WL 5176839, at *27).

Crafting the Answer: Complete, Separate, and Under Oath

When a party does not object, Rule 33(b)(3) commands an answer that is separate, full, and in writing, and verified under oath. "Full" is the demanding word. The duty is to answer using all nonprivileged, responsive information that is immediately available to the party, its attorneys, agents, or representatives; that is under the party's control; or that can be obtained after a reasonable investigation (VeroBlue Farms, 2021 WL 5176839, at *27; Younes v. 7-Eleven, Inc., 312 F.R.D. 692, 705 (D.N.J. 2015)). The reasonable-inquiry duty is not optional, and it is not satisfied by writing down whatever first comes to mind. An entity must canvas its employees and agents and search its records; a designated representative who answers only from personal recollection has failed the duty (Morris v. Lowe's Home Centers, Inc., 2012 WL 5347826, at *4–5 (M.D.N.C. Oct. 26, 2012)).

The duty is bounded by reasonableness, however. A responding party need not become an investigator for its opponent, speculate, or chase down information that diligent effort cannot locate. When information genuinely cannot be found after a reasonable search, the proper response is to say so clearly and to describe the efforts made: "After a reasonable inquiry, including a search of Borealis's quality-control database and interviews with the three engineers who supervised the component line, Borealis has been unable to locate records identifying the specific lot numbers shipped before March 2023, which predate the implementation of Borealis's current tracking system." A statement like that, made in good faith, satisfies Rule 33 (Bryant v. Armstrong, 285 F.R.D. 596, 612 (S.D. Cal. 2012)). A bare "unknown," by contrast, invites a motion to compel.

Two structural practices reduce friction. First, follow local formatting rules — many districts require the full text of each interrogatory to be restated before the answer, and many require objections to be stated before any substantive response. Second, when an answer is given subject to objections, say so explicitly ("Subject to and without waiving the foregoing objections, Borealis responds as follows"), and answer the unobjectionable portion of any compound question. Doing so demonstrates good faith, narrows the dispute, and forecloses an argument that the responder simply stonewalled.

Counsel must also remember Rule 26(g). When the lawyer signs the response, the signature certifies that, after a reasonable inquiry, the response is complete and correct as of the time it is made and is not interposed for any improper purpose. The reasonableness of the lawyer's inquiry is judged objectively, on the facts known at the time, in light of the case's complexity, the availability of witnesses and documents, the lawyer's prior working relationship with the client, and the time available (S2 Automation LLC v. Micron Technology, Inc., 2012 WL 3656454, at *31 (D.N.M. Aug. 9, 2012)). Sanctions follow a violation, independent of any motion to compel.

Here is a worked example bringing the pieces together:

Interrogatory No. 2: Identify each person who participated in Borealis's decision to ship the components delivered to Acme between June and September 2024, and for each person state his or her role in that decision.

Response to Interrogatory No. 2: Subject to and without waiving its General Objections, Borealis responds as follows. Based on a reasonable inquiry, including review of approval records and interviews with the personnel involved, the persons who participated in the decision to ship the components delivered to Acme between June and September 2024 were: (1) Priya Nandakumar, Director of Quality Assurance, who reviewed and approved the lot-release certificates; (2) Marcus Vogel, Production Line Supervisor, who certified that the components met specification; and (3) Lena Ostrowski, VP of Operations, who gave final authorization to ship. Borealis's investigation is ongoing and it reserves the right to supplement this answer pursuant to Rule 26(e).

The Duty to Supplement Under Rule 26(e)

An interrogatory answer is not a snapshot frozen on the day it was served. Rule 26(e)(1)(A) imposes a continuing duty: a party that has responded to an interrogatory must supplement or correct its response "in a timely manner if the party learns that in some material respect the disclosure or response is incomplete or incorrect, and if the additional or corrective information has not otherwise been made known to the other parties during the discovery process or in writing." The duty runs throughout the litigation. If Borealis later discovers a fourth participant in the shipping decision, or learns that its earlier answer about lot numbers was wrong, it must update the answer. The exception — "otherwise made known during the discovery process" — means that information already disclosed in a deposition, a document production, or correspondence need not be formally re-served as a supplemental interrogatory answer, although careful practitioners often do so to keep the record clean.

The duty has sharp consequences. Under Rule 37(c)(1), a party that fails to supplement may be barred from using the omitted information or witness at trial, on a motion, or at a hearing, unless the failure was substantially justified or harmless — and the court may impose additional sanctions. The party who surprises an opponent at trial with a witness or theory never disclosed in interrogatory answers risks having that witness or theory excluded. Supplementation is therefore not a courtesy; it is a strategic necessity. It is also where contention interrogatories and the duty to supplement intersect: a party that answered a contention interrogatory early with "investigation continues" must, as discovery develops its theory, supplement to disclose the facts and theories it actually intends to rely on, or face preclusion.

Interrogatories in the Discovery Ecosystem: Choosing the Right Tool

Interrogatories are one instrument in a larger kit, and a recurring drafting mistake is to reach for them when another device would do the job better, faster, or without consuming the precious twenty-five. Before serving, ask whether the information is better obtained another way.

If the goal is to establish that a discrete fact is undisputed — that a particular document is authentic, that a signature is genuine, that a contract was in force on a given date — a request for admission under Rule 36 is usually the better tool. Requests for admission are designed to remove uncontested issues from the case, not to develop unknown facts (United States v. 216 Bottles, 36 F.R.D. 695, 701 (E.D.N.Y. 1965); Watterson v. Garfield Beach CVS LLC, 2015 WL 2156857, at *3 (N.D. Cal. May 7, 2015)). They carry a decisive procedural advantage as well: the Federal Rules impose no numerical cap on requests for admission, so a party can deploy them freely where it would otherwise burn interrogatories. The two devices pair naturally — an admission narrows an issue, and a follow-up interrogatory ("If Your response to Request for Admission No. 5 is anything other than an unqualified admission, state all facts supporting Your denial") forces the opponent to justify a denial. For the mechanics and strategy of admissions, see Strategic Responses to Requests for Admission.

If the goal is to obtain documents, the right device is a Rule 34 request for production, not an interrogatory; courts will not let a party use interrogatories as a backdoor document request (Terracon Consultants, 2013 WL 1633572, at *3). Rule 33(d) lets a party answer with documents, but it does not turn an interrogatory into a production request. See Mastering Document Discovery.

If the goal is to probe a witness's credibility, explore nuance, or follow a thread in real time, a deposition is superior. Interrogatory answers are drafted by lawyers and sanded smooth; a deposition captures the witness's own words and permits the next question to build on the last. Interrogatories shine for fixed, listable facts — identities, dates, amounts, the basis of a damages number — and for locking down positions in writing; depositions shine for everything that depends on spontaneity, demeanor, and follow-up (see The Art and Science of Depositions and, from the defending side, The Art of Defending Depositions in Federal Court).

And if the witness is a nonparty, interrogatories are simply unavailable. The substitute is a deposition by written question under Rule 31 — rarely used in practice — or, far more commonly, an oral deposition under Rule 30 backed by a subpoena. A litigant who needs written facts from a nonparty must plan around this limitation from the outset.

When the System Breaks Down: Meet and Confer, Motions to Compel, and Sanctions

Most interrogatory disputes should be resolved without a judge. Before moving to compel, Rule 37(a)(1) requires the movant to certify that it has "in good faith conferred or attempted to confer" with the opposing party. Many districts have their own meet-and-confer rules that demand a real conversation — sometimes a telephonic or in-person one, not an exchange of form letters. The meet-and-confer is not a formality to be checked off; it is the place where overbreadth becomes a narrowed time frame, where a burden objection becomes a phased production, and where a vague term gets defined. The party seeking the information should come prepared to explain why each disputed interrogatory ties to a claim or defense and to propose compromises; the objecting party should come prepared to explain the specific basis for each objection and to offer alternatives — a narrower scope, a different format, production under a protective order, or agreed search terms and custodians. Document the conferral: dates, participants, issues discussed, agreements reached, and points left open. That record both satisfies the certification requirement and frames the eventual motion.

When conferral fails, the requesting party moves to compel under Rule 37(a)(3)(B). An evasive or incomplete answer is treated as a failure to answer (Rule 37(a)(4)), so a non-answer dressed up as an answer is fair game. The motion should attach the disputed interrogatories and the responses, recite the meet-and-confer history, and explain, interrogatory by interrogatory, why the information is relevant and proportional and why each objection fails. As a general matter the movant bears the burden of showing relevance and proportionality, but when the responding party asserts privilege or a specific protective objection, the burden shifts to that party to establish the objection's validity — privilege is never presumed, and the party invoking it must prove it. On proportionality in particular, the burdens split: the objecting party must come forward with concrete evidence of burden, after which the requesting party must justify the need.

The motion to compel carries a built-in cost-shifting presumption that lawyers on both sides should respect. Under Rule 37(a)(5)(A), if the motion is granted (or if the requested discovery is provided after the motion is filed), the court must, after an opportunity to be heard, require the losing party or its counsel to pay the movant's reasonable expenses, including attorney's fees, unless the movant filed without first attempting in good faith to confer, the opposing party's position was substantially justified, or other circumstances make an award unjust. Conversely, if the motion is denied, Rule 37(a)(5)(B) flips the presumption and the movant may have to pay the respondent's fees. And if the motion is granted in part and denied in part, the court may apportion expenses. This symmetry is a powerful incentive to confer seriously and to assert only objections one is prepared to defend.

If a court orders a party to answer and the party defies the order, the consequences escalate sharply under Rule 37(b)(2). The court may treat designated facts as established, prohibit the disobedient party from supporting or opposing claims or introducing certain evidence, strike pleadings, stay the case until the order is obeyed, dismiss the action in whole or part, render a default judgment, or treat the disobedience as contempt — and it must ordinarily order payment of the resulting expenses and fees. Separately, Rule 37(d) authorizes sanctions, including those just listed, where a party simply fails to serve any answer to interrogatories at all, and that sanction is available without first obtaining an order to compel. Reasonable-inquiry failures and improper certifications are independently sanctionable under Rule 26(g). Courts have not hesitated to impose real consequences for interrogatory abuse — for incomplete answers, for failures to investigate, and for the boilerplate objections that Rule 33 forbids (Rodman v. Safeway Inc., 2016 WL 5791210, at *3–5 (N.D. Cal. Oct. 4, 2016); Heller, 303 F.R.D. at 483–84). The responding party that wants protection from inappropriate interrogatories has its own avenue: a motion for a protective order under Rule 26(c), which can limit, condition, or forbid the discovery on a showing of good cause.

Interrogatories as Offense and Defense: Strategy

Interrogatories are a two-edged tool, and the best practitioners think about both edges from the start of a case. The sword-and-shield framing is useful here, much as it is for requests for admission.

On offense, interrogatories are most valuable for three jobs. First, mapping the terrain: early identification interrogatories ("Identify every person with knowledge of the negotiation of the Supply Agreement") tell you whom to depose and where the documents live, letting you build the rest of your discovery plan efficiently. Second, locking down contentions: late-stage contention interrogatories force the opponent to commit to its factual basis for each claim or defense, which both narrows the issues for trial and exposes theories that have no evidentiary support — fertile ground for summary judgment. Third, manufacturing usable admissions and impeachment fodder: a precisely worded interrogatory can extract a sworn statement that boxes the opponent in. Because the answer is under oath, a witness who later testifies inconsistently at deposition or trial can be confronted with the verified answer, and an answer that concedes an element can be quoted in a dispositive motion (Rule 33(c) confirms that an answer may be used to the extent the rules of evidence allow). Reserve some of your twenty-five questions for this late-case work; do not spend the entire allotment on opening identification questions you could have obtained from Rule 26(a) disclosures.

On defense, the goals are completeness without overexposure, and protection of what is genuinely protectable. Answer fully and accurately — shading or minimizing an unfavorable fact is both unethical and, when exposed, devastating to credibility — but answer the question that was asked, not a broader one you imagine the opponent wishes it had asked. If a question targets a specific time period or specific people, confine the answer to that period and those people. Assert only objections you can defend with specificity and would be willing to argue to the judge, because the cost-shifting presumption of Rule 37(a)(5) punishes objections interposed for delay. Use the meet-and-confer to narrow burdensome requests rather than stonewalling and inviting a motion. Where sensitive but discoverable material is at stake — trade secrets, customer lists, pricing, personal financial data — the answer is usually a protective order under Rule 26(c) that limits use and dissemination, not a flat refusal to answer; for trade-secret-specific concerns, see Building a Trade Secret Protection Program From Scratch.

A word on reciprocity. Discovery is a long game played with the same opposing counsel and before the same judge. A party that hides behind technical objections and grudging answers should expect the same treatment in return and a skeptical reception from the court when it later seeks discovery of its own. Reasonable cooperation is not weakness; it is the posture most likely to earn the court's trust when a genuinely important dispute arises. Calibrate aggressiveness to the case: a party that plans to seek broad discovery is usually better served by answering reasonably than by inviting a discovery war it cannot win. These dynamics, and the way written discovery feeds the larger case strategy, are explored in A Comprehensive Guide to Federal Civil Litigation for Small Businesses.

A Compact Checklist for Responding to Interrogatories

The following sequence captures the disciplined response process:

  1. Calendar the deadline. Thirty days from service, adjusted for service method and any local-rule or stipulated extension. Missing it risks waiver of objections.
  2. Read the local rules and the judge's individual rules. Formatting, restatement of text, uniform definitions, contention-interrogatory timing.
  3. Count the interrogatories, including discrete subparts. Identify any past twenty-five and any subpart that opens a distinct line of inquiry.
  4. Conduct the reasonable inquiry. Interview the people who know; search the records. Document the search.
  5. Draft objections with specificity, tied to each question, stating whether anything is withheld. Answer every unobjectionable portion. Abandon boilerplate.
  6. Decide on Rule 33(d). Where appropriate, elect it expressly and specify the records with particularity, with an index if voluminous.
  7. Prepare a privilege log for anything withheld on privilege grounds.
  8. Verify under oath. The party (or designated corporate representative) signs; counsel signs the objections and certifies under Rule 26(g).
  9. Diary the duty to supplement. Build a system to update answers as the case develops, on pain of Rule 37(c)(1) preclusion.
  10. Confer in good faith before any motion. Resolve what you can; document the rest.

Frequently Asked Questions

How many interrogatories can I serve? Twenty-five per opposing party, including all discrete subparts, unless the parties stipulate or the court orders more (Rule 33(a)(1)). In a multi-defendant case, the cap applies separately to each defendant. Leave to serve more is available but not automatic; the court applies the Rule 26(b)(1) and 26(b)(2) limits.

Do subparts count against the limit? Sometimes. A subpart that merely elaborates the primary question — the who, when, where, and what of a communication, for example — generally counts as part of a single interrogatory. A subpart that opens a genuinely distinct line of inquiry counts as a separate interrogatory. The test is whether the subpart is logically or factually subsumed within the primary question (Thermal Design, 2011 WL 1527025, at *2–3; Superior Communications, 257 F.R.D. at 218).

Can I object that an interrogatory is irrelevant because it is not reasonably calculated to lead to admissible evidence? No — that phrase no longer states the standard after the 2015 amendments and courts overrule objections that rely on it. Object, if at all, on the ground that the information is not relevant to any party's claim or defense, or is not proportional to the needs of the case, and explain why.

Who bears the burden on a proportionality objection? The responding party bears the initial burden of demonstrating that the discovery is disproportionate, because it is best positioned to assess the cost and time of compliance; only then must the requesting party justify the need (State Farm v. Pointe Physical Therapy, 255 F. Supp. 3d at 705; Michelo, 2020 WL 9423921, at *5). A burden objection unsupported by concrete figures will be overruled.

Are general or boilerplate objections still allowed? A short general-objections section is permissible only for genuine, specific objections that truly apply across the entire set, each with an articulated basis. Generic, label-only boilerplate violates Rule 33(b)(4)'s specificity requirement and may be disregarded, stricken, or sanctioned (Heller, 303 F.R.D. at 483–84).

Can I use interrogatories to get documents? No. Use a Rule 34 request for production for documents; an interrogatory may be answered by producing business records under Rule 33(d), but it cannot serve as a document request (Terracon Consultants, 2013 WL 1633572, at *3).

Can I serve interrogatories on a witness who is not a party? No. Interrogatories run only between parties. To get information from a nonparty, use an oral deposition under Rule 30 (with a subpoena) or, rarely, a deposition by written question under Rule 31 (Ward, 262 F.R.D. at 261).

Who has to sign the answers? The party answers under oath — an individual party personally, or a designated officer or agent for an entity, who may verify on information and belief gathered from the organization. Counsel signs the objections and certifies the response under Rule 26(g), but counsel generally cannot verify the answers in the client's place.

What happens if I learn my earlier answer was wrong? Rule 26(e) requires you to supplement or correct it in a timely manner if the new information is material and has not otherwise been made known to the other side. Failing to supplement can result in exclusion of the omitted evidence or witness under Rule 37(c)(1).

What does it cost to lose a motion to compel? Under Rule 37(a)(5), the court must ordinarily order the losing side to pay the prevailing side's reasonable expenses, including attorney's fees, unless an exception applies. The presumption runs in both directions, which is a strong reason to confer in good faith and to assert only defensible objections.

Key Takeaways

Interrogatories reward preparation and punish carelessness. Master the numerical limit and the counting of discrete subparts so you neither waste your own questions nor over-answer your opponent's. Build the front end with care — precise definitions, lawful instructions, and questions sharp enough to be answerable and broad enough to be useful. Frame and contest discovery in the post-2015 vocabulary of relevance "to a claim or defense" and proportionality, and remember that the objecting party must back a burden objection with real numbers, not slogans. Use contention interrogatories — but use them late, when the record can support a complete answer, and watch the local rules on timing. Know Rule 33(d) cold: it is a genuine convenience when the burden is equal and the records are specified, and a trap when invoked loosely. Pick the right tool — admissions to narrow, requests for production to get documents, depositions to probe — and save your interrogatories for the listable facts and the contentions only they can pin down. Verify properly, because an unsworn answer is no answer. Abandon boilerplate, object with specificity, and answer every unobjectionable part. Honor the continuing duty to supplement, lest your best evidence be excluded. And remember that the entire system is backed by Rule 37's cost-shifting and sanctions, which reward the cooperative and well-prepared practitioner and penalize the obstructive one. Handled with discipline, interrogatories are among the most efficient and powerful tools in the civil litigator's kit — a way to develop facts cheaply, pin down an opponent, and shape the case toward favorable resolution.

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Disclaimer: This article is provided for general informational purposes only and does not constitute legal advice. The law governing discovery varies by jurisdiction and changes over time, and the application of any rule depends on the specific facts of a case. Readers should consult qualified counsel before acting on any matter discussed here. Reading this article does not create an attorney-client relationship with mclaw.io.