(B) Proceedings Exempt from Initial Disclosure. The following proceedings are exempt from initial disclosure:
(i) an action for review on an administrative record;
(ii) a forfeiture action in rem arising from a federal statute;
(iii) a petition for habeas corpus or any other proceeding to challenge a criminal conviction or sentence;
(iv) an action brought without an attorney by a person in the custody of the United States, a state, or a state subdivision;
(v) an action to enforce or quash an administrative summons or subpoena;
(vi) an action by the United States to recover benefit payments;
(vii) an action by the United States to collect on a student loan guaranteed by the United States;
(viii) a proceeding ancillary to a proceeding in another court; and
(ix) an action to enforce an arbitration award.

(C) Time for Initial Disclosures一In General. A party must make the initial disclosures at or within 14 days after the parties' Rule 26(f) conference unless a different time is set by stipulation or court order, or unless a party objects during the conference that initial disclosures are not appropriate in this action and states the objection in the proposed discovery plan. In ruling on the objection, the court must determine what disclosures, if any, are to be made and must set the time for disclosure.
(D) Time for Initial Disclosures一For Parties Served or Joined Later. A party that is first served or otherwise joined after the Rule 26(f) conference must make the initial disclosures within 30 days after being served or joined, unless a different time is set by stipulation or court order.
(E) Basis for Initial Disclosure; Unacceptable Excuses. A party must make its initial disclosures based on the information then reasonably available to it. A party is not excused from making its disclosures because it has not fully investigated the case or because it challenges the sufficiency of another party's disclosures or because another party has not made its disclosures.

(2) Disclosure of Expert Testimony.
(A) In General. In addition to the disclosures required by Rule 26(a)(1), a party must disclose to the other parties the identity of any witness it may use at trial to present evidence under Federal Rule of Evidence 702, 703, or 705.
(B) Witnesses Who Must Provide a Written Report. Unless otherwise stipulated or ordered by the court, this disclosure must be accompanied by a written report一prepared and signed by the witness一if the witness is one retained or specially employed to provide expert testimony in the case or one whose duties as the party's employee regularly involve giving expert testimony. The report must contain:
(i) a complete statement of all opinions the witness will express and the basis and reasons for them;
(ii) the facts or data considered by the witness in forming them;
(iii) any exhibits that will be used to summarize or support them;
(iv) the witness's qualifications, including a list of all publications authored in the previous 10 years;
(v) a list of all other cases in which, during the previous 4 years, the witness testified as an expert at trial or by deposition; and
(vi) a statement of the compensation to be paid for the study and testimony in the case.

(C) Witnesses Who Do Not Provide a Written Report. Unless otherwise stipulated or ordered by the court, if the witness is not required to provide a written report, this disclosure must state:
(i) the subject matter on which the witness is expected to present evidence under Federal Rule of Evidence 702, 703, or 705; and
(ii) a summary of the facts and opinions to which the witness is expected to testify.
(D) Time to Disclose Expert Testimony. A party must make these disclosures at the times and in the sequence that the court orders. Absent a stipulation or a court order, the disclosures must be made:
(i) at least 90 days before the date set for trial or for the case to be ready for trial; or
(ii) if the evidence is intended solely to contradict or rebut evidence on the same subject matter identified by another party under Rule 26(a)(2)(B) or (C), within 30 days after the other party's disclosure.
(E) Supplementing the Disclosure. The parties must supplement these disclosures when required under Rule 26(e).

(3) Pretrial Disclosures.
(A) In General. In addition to the disclosures required by Rule 26(a)(1) and (2), a party must provide to the other parties and promptly file the following information about the evidence that it may present at trial other than solely for impeachment:
(i) the name and, if not previously provided, the address and telephone number of each witness一sepa-rately identifying those the party expects to present and those it may call if the need arises;
(ii) the designation of those witnesses whose testimony the party expects to present by deposition and, if not taken stenographically, a transcript of the pertinent parts of the deposition; and
(iii) an identification of each document or other exhibit, including summaries of other evidence一sepa-rately identifying those items the party expects to offer and those it may offer if the need arises.
(B) Time for Pretrial Disclosures; Objections. Unless the court orders otherwise, these disclosures must be made at least 30 days before trial. Within 14 days after they are made, unless the court sets a different time, a party may serve and promptly file a list of the following objections: any objections to the use under Rule 32(a) of a deposition designated by another party under Rule 26(a)(3)(A)(ii); and any objection, together with the grounds for it, that may be made to the admissibility of materials identified under Rule 26(a)(3)(A)(iii). An objection not so made一except for one under Federal Rule of Evidence 402 or 403一is waived unless excused by the court for good cause.

(4) Form of Disclosures. Unless the court orders otherwise, all disclosures under Rule 26(a) must be in writing, signed, and served.

(b) Discovery Scope and Limits.
(1) Scope in General. Unless otherwise limited by court order, the scope of discovery is as follows: Parties may obtain discovery regarding any nonprivileged matter that is relevant to any party's claim or defense and proportional to the needs of the case, considering 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. Information within this scope of discovery need not be admissible in evidence to be discoverable.

(2) Limitations on Frequency and Extent.
(A) When Permitted. By order, the court may alter the limits in these rules on the number of depositions and interrogatories or on the length of depositions under Rule 30. By order or local rule, the court may also limit the number of requests under Rule 36.
(B) Specific Limitations on Electronically Stored Information. A party need not provide discovery of electronically stored information from sources that the party identifies as not reasonably accessible because of undue burden or cost. On motion to compel discovery or for a protective order, the party from whom discovery is sought must show that the information is not reasonably accessible because of undue burden or cost. If that showing is made, the court may nonetheless order discovery from such sources if the requesting party shows good cause, considering the limitations of Rule 26(b)(2)(C). The court may specify conditions for the discovery.
(C) When Required. On motion or on its own, the court must limit the frequency or extent of discovery otherwise allowed by these rules or by local rule if it determines that:
(i) the discovery sought is unreasonably cumulative or duplicative, or can be obtained from some other source that is more convenient, less burdensome, or less expensive;
(ii) the party seeking discovery has had ample opportunity to obtain the information by discovery in the action; or
(iii) the proposed discovery is outside the scope permitted by Rule 26(b)(1).

(3) Trial Preparation: Materials.
(A) Documents and Tangible Things. Ordinarily, a party may not discover documents and tangible things that are prepared in anticipation of litigation or for trial by or for another party or its representative (including the other party's attorney, consultant, surety, indemnitor, insurer, or agent). But, subject to Rule 26(b)(4), those materials may be discovered if:
(i) they are otherwise discoverable under Rule 26(b)(1); and
(ii) the party shows that it has substantial need for the materials to prepare its case and cannot, without undue hardship, obtain their substantial equivalent by other means.
(B) Protection Against Disclosure. If the court orders discovery of those materials, it must protect against disclosure of the mental impressions, conclusions, opinions, or legal theories of a party's attorney or other representative concerning the litigation.
(C) Previous Statement. Any party or other person may, on request and without the required showing, obtain the person's own previous statement about the action or its subject matter. If the request is refused, the person may move for a court order, and Rule 37(a)(5) applies to the award of expenses. A previous statement is either:
(i) a written statement that the person has signed or otherwise adopted or approved; or
(ii) a contemporaneous stenographic, mechanical, electrical, or other recording一or a transcription of it一that recites substantially verbatim the person's oral statement.

(4) Trial Preparation: Experts.
(A) Deposition of an Expert Who May Testify. A party may depose any person who has been identified as an expert whose opinions may be presented at trial. If Rule 26(a)(2)(B) requires a report from the expert, the deposition may be conducted only after the report is provided.
(B) Trial-Preparation Protection for Draft Reports or Disclosures. Rules 26(b)(3)(A) and (B) protect drafts of any report or disclosure required under Rule 26(a)(2), regardless of the form in which the draft is recorded.
(C) Trial-Preparation Protection for Communications Between a Party's Attorney and Expert W-^t'nesses. Rules 26(b)(3)(A) and (B) protect communications between the party's attorney and any witness required to provide a report under Rule 26(a)(2)(B), regardless of the form of the communications, except to the extent that the communications:
(i) relate to compensation for the expert's study or testimony;
(ii) identify facts or data that the party's attorney provided and that the expert considered in forming the opinions to be expressed; or
(iii) identify assumptions that the party's attorney provided and that the expert relied on in forming the opinions to be expressed.