Rule 26.General Provisions Governing Discovery
Chapter V: Depositions and Discovery · Not amended since adoption on record · Last verified July 14, 2026
Full Text of Rule 26
Advisory Committee Notes
Rule 26(b)(2) limits discovery to “any matter, not privileged, which is relevant to the issues raised by the claims or defenses of any party.” Earlier precedent authorized discovery of any matter, not privileged, relevant to the “subject matter” of the case. The current rule limiting discovery to the issues raised by any claim or defense was intended to narrow the scope of discovery.
Rule 26(b)(4)(A) establishes a two-tiered procedure for discovery concerning witnesses who will provide expert testimony at trial. With respect to retained and specially employed expert witnesses who are expected to testify at trial, the rule authorizes more detailed interrogatories than those permitted concerning other expert witnesses expected to testify at trial because a party can expect retained and specially employed expert witnesses to fully cooperate during discovery and trial. Thus, the rule authorizes interrogatories requesting not only a statement of the opinions the expert is expected to offer and the basis and reasons therefore, but also a statement of the facts and data considered, not just those relied upon, by the expert as well as information concerning the witness’s qualifications, publications and previous expert testimony. Although Rule 26(b)(4)(A)(ii) authorizes interrogatories concerning exhibits that will be used to support or illustrate a retained or specially employed expert witness’s opinion expected to be offered at trial, a complete response to such an interrogatory may not be possible until closer to trial because some such exhibits may not be created until they are actually needed for trial. Thus, a response or supplemented response concerning such exhibits should not be deemed untimely if it was reasonably made in advance of trial. Rule 26(b)(4)(A)(iii) establishes a more limited scope for interrogatories concerning expert witnesses who were not retained or specially employed but who are expected to testify at trial. Treating physicians and public accident investigators will often offer expert testimony at trial even though they have not been retained or specially employed by a party. The more limited duty to respond to interrogatories concerning this category of experts is based upon the recognition that some such witnesses may not fully cooperate with the party who intends to call them at trial thereby making it difficult or impossible for the party intending to call such witness at trial to fully and adequately respond to interrogatories requesting the more detailed information that is discoverable with respect to retained or specially employed expert witnesses expected to testify at trial. A response
under Rule 26(b)(4)(A)(iii) is sufficient if it gives reasonable notice of the expert’s testimony, taking into account the limitations of the party’s knowledge of the facts known by and the opinions held by the expert.
Rule 26(b)(4)(C) & (D) grant trial preparation material or “work product” protection to draft responses to expert interrogatories, drafts of expert disclosures, and certain communications between the lawyer and the expert (or between the representative of the lawyer and the expert) in an effort to avoid costly, and oftentimes inefficient, discovery and to encourage more open and robust communication between the attorney and expert so that the attorney and expert may come to a better mutual understanding of the case. The protection is not absolute. Discovery may be had in the three excepted areas. In addition, pursuant to Rule 26(b)(3), a party may overcome the trial preparation material protection by showing a substantial need for the material in preparation of the case and an inability to obtain the substantial equivalent without undue hardship. The protection is not meant to foreclose inquiry into whether the expert explored other theories in the case at hand; whether the expert has ever explored other theories that were not explored in the case at hand, and if so why such theories were not explored in the case at hand; whether the expert considered any facts which were not relied upon and, if so, why such facts were not relied upon; whether any tests were run or models developed other than those disclosed in interrogatory responses and the results of such tests and/or models; and whether anybody other than the party’s attorney provided support or participation in framing the opinion.
Rule 26(b)(5) governs discovery of electronically stored information and provides that a party may initially refuse to produce electronically stored information from a source that is not reasonably accessible because of undue burden or cost. The rule further provides, however, that a court may grant a motion to compel discovery from such sources upon a showing of good cause after taking into account factors such as the burden, expense and likely benefit of such discovery. The rule explicitly authorizes a court to order the requesting party to pay for some or all of the costs associated with discovery of electronically stored information from a source that is not reasonably accessible.
Rule 26(b)(6) requires a party withholding information based on a claim of privilege or trial preparation material to generally describe such information so as to enable the requesting party to assess the claim. It also establishes a procedure to govern inadvertent disclosure of privileged or trial preparation material.
Rule 26(c) authorizes the court to hold a discovery conference and thereafter enter an order governing discovery. The rule grants the court discretion to limit discovery and to allocate some or all of the expense of discovery to the requesting party when appropriate.
Rule 26(d) grants a court discretion to enter a protective order, among other things, prohibiting or limiting discovery after considering factors such as burden, cost, and likely benefit of such discovery.
Rule 26(f) imposes a duty to supplement. The duty to supplement, while imposed on a party, applies whether the additional or corrective information is learned by the client or by the attorney. Supplementations need not be made as each new item of information is learned but should be made at appropriate intervals during the discovery period, and with special promptness as the trial date approaches. It may be useful for any scheduling order to specify the time or times when supplementations should be made. The obligation to supplement responses to formal discovery requests applies to interrogatories, requests for production, and requests for admissions, but not ordinarily to deposition testimony. However, with respect to retained or specially employed experts, changes in the opinions expressed by the expert, whether in response to an interrogatory, an expert disclosure, or a deposition, are subject to a duty of supplemental disclosure. The obligation to supplement applies whenever a party learns that its prior disclosures or responses are in some material respect incomplete or incorrect. There is, however, no obligation to provide supplemental or corrective information that has been otherwise made known to the parties in writing or during the discovery process, as when a witness not previously disclosed is identified during the taking of a deposition or when an expert during a deposition corrects information contained in an earlier report.
M.R.C.P. 26(g) imposes an affirmative duty to engage in pretrial discovery in a responsible manner that is consistent with the spirit and purposes of Rules 26 through 37. In addition. Rule 26(g) is designed to curb discovery abuse by explicitly encouraging the imposition of sanctions. The subdivision provides a deterrent to both excessive discoverv and evasion bv imposing a certification requirement that obliges each attorney to stop and think about the legitimacy of a discovery request, a response thereto, or an obiection. The term “response” includes answers to interrogatories and to requests to admit as well as responses to production requests.
If primary responsibility for conducting discovery is to continue to rest with the litigants, they must be obliged to act responsibly and avoid abuse. Although the certification duty requires the lawyer to pause and consider the reasonableness of his request, response, or objection, it is not meant to discourage or restrict necessary and legitimate discovery. The rule simply requires that the attorney make a reasonable inquiry into the factual basis of his response, request, or objection.
The duty to make a “reasonable inquiry” is satisfied if the investigation undertaken by the attorney and the conclusions drawn therefrom are reasonable under the circumstances. It is an objective standard similar to the one imposed by Rule 11. In making the inquiry, the attorney may rely on assertions bv the client and on communications with other counsel in the case as long as that reliance is appropriate under the circumstances. Ultimately, what is reasonable is a matter for the court to decide on the totality of the circumstances.
M.R.C.P. 26(g) does not require the signing attorney to certify the truthfulness of the client’s factual responses to a discovery request. Rather, the signature certifies that the lawyer has made a reasonable effort to assure that the client has provided all the information and documents available to him that are responsive to the discovery demand Thus, the lawyer’s certification under M.R.C.P. 6(g) should be distinguished from the requirement that a responding party must sign interrogatory responses under oath pursuant to M.R.C.P. 33(b).
Nor does the rule require a party or an attorney to disclose privileged communications or work product in order to show that a discovery request, response, or objection is substantially justified. The signing requirement means that every discovery request, response, or objection should be grounded on a theory that is reasonable under the precedents or a good faith belief as to what should be the law. This standard is heavily dependent on the circumstances of each case. The certification speaks as of the time it is made. The duty to supplement discovery responses continues to be governed by M.R.C.P. 26(e).
The premise of Rule 26(g) is that imposing sanctions on attorneys who fail to meet the rule’s standards will significantly reduce abuse by imposing disadvantages therefor. The rule mandates that sanctions be imposed on attorneys who fail to meet the standards established in the first portion of Rule 26(g). The nature of the sanction is a matter of judicial discretion to be exercised in light of the particular circumstances. The sanctioning process must comport with due process requirements. The kind of notice and hearing required will depend on the facts of the case and the severity of the sanction being considered. To prevent the proliferation of the sanction procedure and to avoid multiple hearings, discovery in any sanction proceeding normally should be permitted only when it is clearly required by the interests of justice. In most cases the court will be aware of the circumstances and only a brief hearing should be necessary.
Amendment History
Effective January 1, 2020, M.R.C.P. 26 was amended so as to include subparagraph (g).
Effective January 1, 2020, Rule 26(b) was amended. Rule 26(b)(4) was amended so as to provide for two-tiered discovery regarding witnesses who will offer expert testimony at trial. The amended rule authorizes more detailed interrogatories concerning expert witnesses who are retained or specially employed and more general interrogatories concerning other witnesses who will provide expert testimony. The amendment also authorizes depositions of any witness who will provide expert testimony at trial. Rule 26(b) was amended so that certain communications between a party and a party’s expert who has been retained or specially employed to provide expert testimony at trial are deemed trial preparation material. Rule 26(b)(5) governing discovery of electronically stored information was amended so as to refer to “electronically stored information” rather than “data or information in electronic or magnetic form.” The amendment also provides a nonexhaustive list of the types of conditions a judge may place on electronic discovery. Rule 26(b) was further amended so as to include subsection (6), which requires a responding party to generally describe information withheld from discovery based an allegation of privilege or trial preparation material and established a process to deal with inadvertent production of privileged or trial preparation material.
Effective May 29, 2003, Rule 26(b) was amended by adding subsection (5) governing discovery of data or information in electronic or magnetic form.
Effective April 13, 2000, Rule 26(c) was amended to allow the court on its own motion to convene a discovery conference, 753-754 So. 2d XVII (West Miss. Cas. 2000).
Effective March 13, 1991, Rule 26(b)(1)(ii) was amended to delete the oral testimony of witnesses from the listing of matter that might be discovered by a party. Rule 26(d) was amended to provide that in the case of depositions protective orders might be made by the court that issued a subpoena therefor. 574-576 So. 2d XXIII (West Miss. Cas. 1991).
Effective March 1, 1989, Rule 26(b)(1) and Rule 26(f)(1) were amended to provide for the identification of (and supplementation of the prior identification of) those, in addition to experts, who may be called as witnesses at the trial. 536-538 So. 2d XXIV (West Miss. Cas. 1989).
Plain-English Summary
Rule 26(a) lists the tools of discovery — oral and written depositions, interrogatories, requests to produce documents or things or to enter land, and requests for admission — and, unless the court says otherwise, none of them is limited in how often it can be used. Rule 26(b)(1) sets the basic scope: parties may discover any matter, not privileged, that is relevant to the issues raised by the claims or defenses in the case, including the existence and location of documents, electronically stored information, and people with knowledge of the case or who might be called as witnesses. Information does not have to be admissible at trial to be discoverable; it is enough that it appears reasonably calculated to lead to admissible evidence. Rule 26(b)(2) separately makes the existence and contents of an insurance agreement that might cover a judgment discoverable, even though disclosing it does not make it admissible at trial.
Rule 26(b)(3) protects documents and things prepared in anticipation of litigation — a party can get them only by showing a substantial need for the materials and an inability to get their substantial equivalent without undue hardship, and even then the court has to shield an attorney's mental impressions, conclusions, opinions, and legal theories. A party's own prior statement about the case, though, can be obtained without that showing, and any person, not just a party, can get a copy of their own previous statement or move for a court order if it is refused.
Rule 26(b)(4) creates a two-tiered structure for expert discovery. For a retained or specially employed expert expected to testify at trial, interrogatories can reach the expert's opinions, the facts and data considered, exhibits to be used, qualifications, and past testimony, and that expert can also be deposed once interrogatory answers are in hand. For other witnesses expected to give expert testimony who were not retained or specially employed — treating physicians, for example — the interrogatories reach only the general subject matter and a summary of the facts and opinions expected. Rule 26(b)(3) and (4) together shield draft expert disclosures and most attorney-expert communications from discovery, apart from three specific exceptions covering the expert's compensation and any facts, data, or assumptions the attorney gave the expert to work from. A party deposing an opposing side's specially retained expert generally has to pay that expert a reasonable fee for the deposition and limited preparation time.
The remaining subdivisions round out how discovery is managed. Rule 26(b)(5) lets a party decline to produce electronically stored information that is not reasonably accessible because of undue burden or cost, subject to a good-cause override and a range of conditions the court can impose, including shifting costs to the requesting party. Rule 26(b)(6) requires a party withholding privileged or trial-preparation material to describe it well enough for others to assess the claim, and sets a clawback procedure for inadvertent disclosure. Rule 26(c) authorizes a discovery conference to set the scope and schedule of discovery, and Rule 26(d) lets the court enter a protective order limiting discovery to prevent annoyance, embarrassment, oppression, or undue burden or expense. Rule 26(f) imposes an ongoing duty to supplement discovery responses that turn out to be incomplete or incorrect, and Rule 26(g) requires every discovery request, response, or objection to be signed, certifying that it is well grounded, not made for an improper purpose, and not unreasonable or unduly burdensome — a certification the court must enforce with sanctions when it is violated without substantial justification.
Frequently Asked Questions
What can I ask for in discovery under Rule 26?
Rule 26(b)(1) allows discovery of any non-privileged matter relevant to the issues raised by the claims or defenses in the case, including documents, electronically stored information, and the identity of people with knowledge of the case. Information does not need to be admissible itself, as long as it appears reasonably calculated to lead to admissible evidence.
Can I find out whether the other side has insurance that might cover a judgment against them?
Yes. Rule 26(b)(2) makes the existence and contents of a relevant insurance agreement discoverable, though disclosure of that information does not make it admissible in evidence at trial.
What protects an attorney's notes and strategy from being discovered by the other side?
Rule 26(b)(3) protects materials prepared in anticipation of litigation unless the requesting party shows substantial need and an inability to get the substantial equivalent without undue hardship, and even then the court must protect the mental impressions, conclusions, opinions, and legal theories of an attorney or other representative.
How does discovery about expert witnesses work differently from discovery about other witnesses?
Rule 26(b)(4) sets a two-tiered approach: retained or specially employed experts expected to testify are subject to more detailed interrogatories and can be deposed, while other witnesses expected to give expert testimony, such as a treating physician, are subject only to more limited interrogatories about the general subject matter and a summary of facts and opinions.
What happens if I don't sign a discovery request or response, or if I learn my answer was incomplete?
Rule 26(g) requires the court to strike an unsigned discovery request, response, or objection unless it is promptly signed once the omission is pointed out, and it requires sanctions when a signed certification violates the rule without substantial justification. Separately, Rule 26(f) requires a party to supplement or correct a disclosure or response that turns out to be materially incomplete or incorrect.