Rule 23.1. Derivative Actions
(a) Prerequisites. This rule applies when one or more shareholders or members of a corporation or an unincorporated association bring a derivative action to enforce a right that the corporation or association may properly assert but has failed to enforce. The derivative action may not be maintained if it appears that the plaintiff does not fairly and adequately represent the interests of shareholders or members who are similarly situated in enforcing the right of the corporation or association.

(b) Pleading Requirements. The complaint must be verified and must:
(1) allege that the plaintiff was a shareholder or member at the time of the transaction complained of, or that the plaintiff's share or membership later devolved on it by operation of law;
(2) allege that the action is not a collusive one to confer jurisdiction that the court would otherwise lack; and
(3) state with particularity:
(A) any effort by the plaintiff to obtain the desired action from the directors or comparable authority and, if necessary, from the shareholders or members; and
(B) the reasons for not obtaining the action or not making the effort.

(c) Settlement, Dismissal, and Compromise. A derivative action may be settled, voluntarily dismissed, or compromised only with the court's approval. Notice of a proposed settlement, voluntary dismissal, or compromise must be given to shareholders or members in the manner that the court orders.
(As added Feb. 28, 1966, eff. July 1, 1966; amended Mar. 2, 1987, eff. Aug. 1, 1987; Apr. 30, 2007, eff. Dec. 1, 2007.)

Rule 23.2. Actions Relating to Unincorporated Associations
This rule applies to an action brought by or against the members of an unincorporated association as a class by naming certain members as representative parties. The action may be maintained only if it appears that those parties will fairly and adequately protect the interests of the association and its members. In conducting the action, the court may issue any appropriate orders corresponding with those in Rule 23(d), and the procedure for settlement, voluntary dismissal, or compromise must correspond with the procedure in Rule 23(e).
(As added Feb. 28, 1966, eff. July 1, 1966; amended Apr. 30, 2007, eff. Dec. 1, 2007.)

Rule 24. Intervention
(a) Intervention of Right. On timely motion, the court must permit anyone to intervene who:
(1) is given an unconditional right to intervene by a federal statute; or
(2) claims an interest relating to the property or transaction that is the subject of the action, and is so situated that disposing of the action may as a practical matter impair or impede the movant's ability to protect its interest, unless existing parties adequately represent that interest.

(b) Permissive Intervention.
(1) In General. On timely motion, the court may permit anyone to intervene who:
(A) is given a conditional right to intervene by a federal statute; or
(B) has a claim or defense that shares with the main action a common question of law or fact.
(2) By a Government Officer or Agency. On timely motion, the court may permit a federal or state governmental officer or agency to intervene if a party's claim or defense is based on:
(A) a statute or executive order administered by the officer or agency; or
(B) any regulation, order, requirement, or agreement issued or made under the statute or executive order.
(3) Delay or Prejudice. In exercising its discretion, the court must consider whether the intervention will unduly delay or prejudice the adjudication of the original parties' rights.

(c) Notice and Pleading Required. A motion to intervene must be served on the parties as provided in Rule 5. The motion must state the grounds for intervention and be accompanied by a pleading that sets out the claim or defense for which intervention is sought.
(As amended Dec. 27, 1946, eff. Mar. 19, 1948; Dec. 29, 1948, eff. Oct. 20, 1949; Jan. 21, 1963, eff. July 1, 1963; Feb. 28, 1966, eff. July 1, 1966; Mar. 2, 1987, eff. Aug. 1, 1987; Apr. 30, 1991, eff. Dec. 1, 1991; Apr. 12, 2006, eff. Dec. 1, 2006; Apr. 30, 2007, eff. Dec. 1, 2007.)

Rule 25. Substitution of Parties
(a) Death.
(1) Substitution if the Claim Is Not Extinguished. If a party dies and the claim is not extinguished, the court may order substitution of the proper party. A motion for substitution may be made by any party or by the decedent's successor or representative. If the motion is not made within 90 days after service of a statement noting the death, the action by or against the decedent must be dismissed.
(2) Continuation Among the Remaining Parties. After a party's death, if the right sought to be enforced survives only to or against the remaining parties, the action does not abate, but proceeds in favor of or against the remaining parties. The death should be noted on the record.
(3) Service. A motion to substitute, together with a notice of hearing, must be served on the parties as provided in Rule 5 and on nonparties as provided in Rule 4. A statement noting death must be served in the same manner. Service may be made in any judicial district.

(b) INCOMPETENCY. If a party becomes incompetent, the court may, on motion, permit the action to be continued by or against the party's representative. The motion must be served as provided in Rule 25(a)(3).
(c) Transfer of Interest. If an interest is transferred, the action may be continued by or against the original party unless the court, on motion, orders the transferee to be substituted in the action or joined with the original party. The motion must be served as provided in Rule 25(a)(3).
(d) Public Officers; Death or Separation from Office. An action does not abate when a public officer who is a party in an official capacity dies, resigns, or otherwise ceases to hold office while the action is pending. The officer's successor is automatically substituted as a party. Later proceedings should be in the substituted party's name, but any misnomer not affecting the parties' substantial rights must be disregarded. The court may order substitution at any time, but the absence of such an order does not affect the substitution.
(As amended Dec. 29, 1948, eff. Oct. 20, 1949; Apr. 17, 1961, eff. July 19, 1961; Jan. 21, 1963, eff. July 1, 1963; Mar. 2, 1987, eff. Aug. 1, 1987; Apr. 30, 2007, eff. Dec. 1, 2007.)

TITLE V. DISCLOSURES AND DISCOVERY
Rule 26. Duty to Disclose; General Provisions Governing Discovery
(a) Required Disclosures.
(1) Initial Disclosure.
(A) In General. Except as exempted by Rule 26(a)(1)(B) or as otherwise stipulated or ordered by the court, a party must, without awaiting a discovery request, provide to the other parties:
(i) the name and, if known, the address and telephone number of each individual likely to have discoverable information一along with the subjects of that information一that the disclosing party may use to support its claims or defenses, unless the use would be solely for impeachment;
(ii) a copy一or a description by category and location一of all documents, electronically stored information, and tangible things that the disclosing party has in its possession, custody, or control and may use to support its claims or defenses, unless the use would be solely for impeachment;
(iii) a computation of each category of damages claimed by the disclosing party一who must also make available for inspection and copying as under Rule 34 the documents or other evidentiary material, unless privileged or protected from disclosure, on which each computation is based, including materials bearing on the nature and extent of injuries suffered; and
(iv) for inspection and copying as under Rule 34, any insurance agreement under which an insurance business may be liable to satisfy all or part of a possible judgment in the action or to indemnify or reimburse for payments made to satisfy the judgment.