Federal Rules

(a) Prerequisites. One or more members of a class may sue or be sued as representative parties on behalf of all members only if:

(1) the class is so numerous that joinder of all members is impracticable;

(2) there are questions of law or fact common to the class;

(3) the claims or defenses of the representative parties are typical of the claims or defenses of the class; and

(4) the representative parties will fairly and adequately protect the interests of the class.

(b) Types of Class Actions. A class action may be maintained if Rule 23(a) is satisfied and if:

(1) prosecuting separate actions by or against individual class members would create a risk of:

(A) inconsistent or varying adjudications with respect to individual class members that would establish incompatible standards of conduct for the party opposing the class; or

(B) adjudications with respect to individual class members that, as a practical matter, would be dispositive of the interests of the other members not parties to the individual adjudications or would substantially impair or impede their ability to protect their interests;

(2) the party opposing the class has acted or refused to act on grounds that apply generally to the class, so that final injunctive relief or corresponding declaratory relief is appropriate respecting the class as a whole; or

(3) the court finds that the questions of law or fact common to class members predominate over any questions affecting only individual members, and that a class action is superior to other available methods for fairly and efficiently adjudicating the controversy. The matters pertinent to these findings include:

(A) the class members’ interests in individually controlling the prosecution or defense of separate actions;

(B) the extent and nature of any litigation concerning the controversy already begun by or against class members;

(C) the desirability or undesirability of concentrating the litigation of the claims in the particular forum; and

(D) the likely difficulties in managing a class action.

(c) Certification Order; Notice to Class Members; Judgment; Issues Classes; Subclasses.

(1) Certification Order.

(A) Time to Issue. At an early practicable time after a person sues or is sued as a class representative, the court must determine by order whether to certify the action as a class action.

(B) Defining the Class; Appointing Class Counsel. An order that certifies a class action must define the class and the class claims, issues, or defenses, and must appoint class counsel under Rule 23(g).

(C) Altering or Amending the Order. An order that grants or denies class certification may be altered or amended before final judgment.

(2) Notice.

(A) For (b)(1) or (b)(2) Classes. For any class certified under Rule 23(b)(1) or (b)(2), the court may direct appropriate notice to the class.

(B) For (b)(3) Classes. For any class certified under Rule 23(b)(3), the court must direct to class members the best notice that is practicable under the circumstances, including individual notice to all members who can be identified through reasonable effort. The notice must clearly and concisely state in plain, easily understood language:

(i) the nature of the action;

(ii) the definition of the class certified;

(iii) the class claims, issues, or defenses;

(iv) that a class member may enter an appearance through an attorney if the member so desires;

(v) that the court will exclude from the class any member who requests exclusion;

(vi) the time and manner for requesting exclusion; and

(vii) the binding effect of a class judgment on members under Rule 23(c)(3).

(3) Judgment. Whether or not favorable to the class, the judgment in a class action must:

(A) for any class certified under Rule 23(b)(1) or (b)(2), include and describe those whom the court finds to be class members; and

(B) for any class certified under Rule 23(b)(3), include and specify or describe those to whom the Rule 23(c)(2) notice was directed, who have not requested exclusion, and whom the court finds to be class members.

(4) Particular Issues. When appropriate, an action may be brought or maintained as a class action with respect to particular issues.

(5) Subclasses. When appropriate, a class may be divided into subclasses that are each treated as a class under this rule.

(d) Conducting the Action.

(1) In General. In conducting an action under this rule, the court may issue orders that:

(A) determine the course of proceedings or prescribe measures to prevent undue repetition or complication in presenting evidence or argument;

(B) require—to protect class members and fairly conduct the action—giving appropriate notice to some or all class members of:

(i) any step in the action;

(ii) the proposed extent of the judgment; or

(iii) the members’ opportunity to signify whether they consider the representation fair and adequate, to intervene and present claims or defenses, or to otherwise come into the action;

(C) impose conditions on the representative parties or on intervenors;

(D) require that the pleadings be amended to eliminate allegations about representation of absent persons and that the action proceed accordingly; or

(E) deal with similar procedural matters.

(2) Combining and Amending Orders. An order under Rule 23(d)(1) may be altered or amended from time to time and may be combined with an order under Rule 16.

(e) Settlement, Voluntary Dismissal, or Compromise. The claims, issues, or defenses of a certified class may be settled, voluntarily dismissed, or compromised only with the court's approval. The following procedures apply to a proposed settlement, voluntary dismissal, or compromise:

(1) The court must direct notice in a reasonable manner to all class members who would be bound by the proposal.

(2) If the proposal would bind class members, the court may approve it only after a hearing and on finding that it is fair, reasonable, and adequate.

(3) The parties seeking approval must file a statement identifying any agreement made in connection with the proposal.

(4) If the class action was previously certified under Rule 23(b)(3), the court may refuse to approve a settlement unless it affords a new opportunity to request exclusion to individual class members who had an earlier opportunity to request exclusion but did not do so.

(5) Any class member may object to the proposal if it requires court approval under this subdivision (e); the objection may be withdrawn only with the court's approval.

(f) Appeals. A court of appeals may permit an appeal from an order granting or denying class-action certification under this rule if a petition for permission to appeal is filed with the circuit clerk within 14 days after the order is entered. An appeal does not stay proceedings in the district court unless the district judge or the court of appeals so orders.

(g) Class Counsel.

(1) Appointing Class Counsel. Unless a statute provides otherwise, a court that certifies a class must appoint class counsel. In appointing class counsel, the court:

(A) must consider:

(i) the work counsel has done in identifying or investigating potential claims in the action;

(ii) counsel's experience in handling class actions, other complex litigation, and the types of claims asserted in the action;

(iii) counsel's knowledge of the applicable law; and

(iv) the resources that counsel will commit to representing the class;

(B) may consider any other matter pertinent to counsel's ability to fairly and adequately represent the interests of the class;

(C) may order potential class counsel to provide information on any subject pertinent to the appointment and to propose terms for attorney's fees and nontaxable costs;

(D) may include in the appointing order provisions about the award of attorney's fees or nontaxable costs under Rule 23(h); and

(E) may make further orders in connection with the appointment.

(2) Standard for Appointing Class Counsel. When one applicant seeks appointment as class counsel, the court may appoint that applicant only if the applicant is adequate under Rule 23(g)(1) and (4). If more than one adequate applicant seeks appointment, the court must appoint the applicant best able to represent the interests of the class.

(3) Interim Counsel. The court may designate interim counsel to act on behalf of a putative class before determining whether to certify the action as a class action.

(4) Duty of Class Counsel. Class counsel must fairly and adequately represent the interests of the class.

(h) Attorney's Fees and Nontaxable Costs. In a certified class action, the court may award reasonable attorney's fees and nontaxable costs that are authorized by law or by the parties’ agreement. The following procedures apply:

(1) A claim for an award must be made by motion under Rule 54(d)(2), subject to the provisions of this subdivision (h), at a time the court sets. Notice of the motion must be served on all parties and, for motions by class counsel, directed to class members in a reasonable manner.

(2) A class member, or a party from whom payment is sought, may object to the motion.

(3) The court may hold a hearing and must find the facts and state its legal conclusions under Rule 52(a).

(4) The court may refer issues related to the amount of the award to a special master or a magistrate judge, as provided in Rule 54(d)(2)(D).

Notes

(As amended Feb. 28, 1966, eff. July 1, 1966; Mar. 2, 1987, eff. Aug. 1, 1987; Apr. 24, 1998, eff. Dec. 1, 1998; Mar. 27, 2003, eff. Dec. 1, 2003; Apr. 30, 2007, eff. Dec. 1, 2007; Mar. 26, 2009, eff. Dec. 1, 2009.)

Notes of Advisory Committee on Rules—1937

Note to Subdivision (a). This is a substantial restatement of [former] Equity Rule 38 (Representatives of Class) as that rule has been construed. It applies to all actions, whether formerly denominated legal or equitable. For a general analysis of class actions, effect of judgment, and requisites of jurisdiction see Moore, Federal Rules of Civil Procedure: Some Problems Raised by the Preliminary Draft, 25 Georgetown L.J. 551, 570 et seq. (1937); Moore and Cohn, Federal Class Actions, 32 Ill.L.Rev. 307 (1937); Moore and Cohn, Federal Class Actions—Jurisdiction and Effect of Judgment, 32 Ill.L.Rev. 555—567 (1938); Lesar, Class Suits and the Federal Rules, 22 Minn.L.Rev. 34 (1937); cf. Arnold and James, Cases on Trials, Judgments and Appeals (1936) 175; and see Blume, Jurisdictional Amount in Representative Suits, 15 Minn.L.Rev. 501 (1931).

The general test of [former] Equity Rule 38 (Representatives of Class) that the question should be “one of common or general interest to many persons constituting a class so numerous as to make it impracticable to bring them all before the court,” is a common test. For states which require the two elements of a common or general interest and numerous persons, as provided for in [former] Equity Rule 38, see Del.Ch.Rule 113; Fla.Comp.Gen.Laws Ann. (Supp., 1936) §4918 (7); Georgia Code (1933) §37–1002, and see English Rules Under the Judicature Act (The Annual Practice, 1937) O. 16, r. 9. For statutory provisions providing for class actions when the question is one of common or general interest or when the parties are numerous, see Ala.Code Ann. (Michie, 1928) §5701; 2 Ind.Stat.Ann. (Burns, 1933) §2–220; N.Y.C.P.A. (1937) §195; Wis.Stat. (1935) §260.12. These statutes have, however, been uniformly construed as though phrased in the conjunctive. See Garfein v. Stiglitz, 260 Ky. 430, 86 S.W.(2d) 155 (1935). The rule adopts the test of [former] Equity Rule 38, but defines what constitutes a “common or general interest”. Compare with code provisions which make the action dependent upon the propriety of joinder of the parties. See Blume, The “Common Questions” Principle in the Code Provision for Representative Suits, 30 Mich.L.Rev. 878 (1932). For discussion of what constitutes “numerous persons” see Wheaton, Representative Suits Involving Numerous Litigants, 19 Corn.L.Q. 399 (1934); Note, 36 Harv.L.Rev. 89 (1922).

Clause (1), Joint, Common, or Secondary Right. This clause is illustrated in actions brought by or against representatives of an unincorporated association. See Oster v. Brotherhood of Locomotive Firemen and Enginemen, 271 Pa. 419, 114 Atl. 377 (1921); Pickett v. Walsh, 192 Mass. 572, 78 N.E. 753, 6 L.R.A. (N.S.) 1067 (1906); Colt v. Hicks, 97 Ind.App. 177, 179 N.E. 335 (1932). Compare Rule 17(b) as to when an unincorporated association has capacity to sue or be sued in its common name; United Mine Workers of America v. Coronado Coal Co., 259 U.S. 344 (1922) (an unincorporated association was sued as an entity for the purpose of enforcing against it a federal substantive right); Moore, Federal Rules of Civil Procedure: Some Problems Raised by the Preliminary Draft, 25 Georgetown L.J. 551, 566 (for discussion of jurisdictional requisites when an unincorporated association sues or is sued in its common name and jurisdiction is founded upon diversity of citizenship). For an action brought by representatives of one group against representatives of another group for distribution of a fund held by an unincorporated association, see Smith v. Swormstedt, 16 How. 288 (U.S. 1853). Compare Christopher, et al. v. Brusselback, 58 S.Ct. 350 [ 302 U.S. 500 ] (1938).

For an action to enforce rights held in common by policyholders against the corporate issuer of the policies, see Supreme Tribe of Ben Hur v. Cauble, 255 U.S. 356 (1921). See also Terry v. Little, 101 U.S. 216 (1880); John A. Roebling's Sons Co. v. Kinnicutt, 248 Fed. 596 (D.C.N.Y., 1917) dealing with the right held in common by creditors to enforce the statutory liability of stockholders.

Typical of a secondary action is a suit by stockholders to enforce a corporate right. For discussion of the general nature of these actions see Ashwander v. Tennessee Valley Authority, 297 U.S. 288 (1936); Glenn, The Stockholder's Suit—Corporate and Individual Grievances, 33 Yale L.J. 580 (1924); McLaughlin, Capacity of Plaintiff-Stockholder to Terminate a Stockholder's Suit, 46 Yale L.J. 421 (1937). See also Subdivision (b) of this rule which deals with Shareholder's Action; Note, 15 Minn.L.Rev. 453 (1931).

Clause (2). A creditor's action for liquidation or reorganization of a corporation is illustrative of this clause. An action by a stockholder against certain named defendants as representatives of numerous claimants presents a situation converse to the creditor's action.

Clause (3). See Everglades Drainage League v. Napoleon Broward Drainage Dist., 253 Fed. 246 (D.C.Fla., 1918); Gramling v. Maxwell, 52 F.(2d) 256 (D.C.N.C., 1931), approved in 30 Mich.L.Rev. 624 (1932); Skinner v. Mitchell, 108 Kan. 861, 197 Pac. 569 (1921); Duke of Bedford v. Ellis (1901) A.C. 1, for class actions when there were numerous persons and there was only a question of law or fact common to them; and see Blume, The “Common Questions” Principle in the Code Provision for Representative Suits, 30 Mich.L.Rev. 878 (1932).

Note to Subdivision (b). This is [former] Equity Rule 27 (Stockholder's Bill) with verbal changes. See also Hawes v. Oakland, 104 U.S. 450, 26 L.Ed. 827 (1882) and former Equity Rule 94, promulgated January 23, 1882, 104 U.S. IX.

Note to Subdivision (c). See McLaughlin, Capacity of Plaintiff-Stockholder to Terminate a Stockholder's Suit, 46 Yale L.J. 421 (1937).

Notes of Advisory Committee on Rules—1946 Amendment

Subdivision (b), relating to secondary actions by shareholders, provides among other things, that in, such an action the complainant “shall aver (1) that the plaintiff was a shareholder at the time of the transaction of which he complains or that his share thereafter devolved on him by operation of law . . .”

As a result of the decision in Erie R. Co. v. Tompkins, 304 U.S. 64 (decided April 25, 1938, after this rule was promulgated by the Supreme Court, though before it took effect) a question has arisen as to whether the provision above quoted deals with a matter of substantive right or is a matter of procedure. If it is a matter of substantive law or right, then under Erie R. Co. v. Tompkins clause (1) may not be validly applied in cases pending in states whose local law permits a shareholder to maintain such actions, although not a shareholder at the time of the transactions complained of. The Advisory Committee, believing the question should be settled in the courts, proposes no change in Rule 23 but thinks rather that the situation should be explained in an appropriate note.

The rule has a long history. In Hawes v. Oakland (1882) 104 U.S. 450, the Court held that a shareholder could not maintain such an action unless he owned shares at the time of the transactions complained of, or unless they devolved on him by operation of law. At that time the decision in Swift v. Tyson (1842) 16 Peters 1, was the law, and the federal courts considered themselves free to establish their own principles of equity jurisprudence, so the Court was not in 1882 and has not been, until Erie R. Co. v. Tompkins in 1938, concerned with the question whether Hawes v. Oakland dealt with substantive right or procedure.

Following the decision in Hawes v. Oakland, and at the same term, the Court, to implement its decision, adopted [former] Equity Rule 94, which contained the same provision above quoted from Rule 23 F.R.C.P. The provision in [former] Equity Rule 94 was later embodied in [former] Equity Rule 27, of which the present Rule 23 is substantially a copy.

In City of Quincy v. Steel (1887) 120 U.S. 241, 245, the Court referring to Hawes v. Oakland said: “In order to give effect to the principles there laid down, this Court at that term adopted Rule 94 of the rules of practice for courts of equity of the United States.”

Some other cases dealing with [former] Equity Rules 94 or 27 prior to the decision in Erie R. Co. v. Tompkins are Dimpfel v. Ohio & Miss. R. R. (1884) 110 U.S. 209; Illinois Central R. Co. v. Adams (1901) 180 U.S. 28, 34; Venner v. Great Northern Ry. (1908) 209 U.S. 24, 30; Jacobson v. General Motors Corp. (S.D.N.Y. 1938) 22 F.Supp. 255, 257. These cases generally treat Hawes v. Oakland as establishing a “principle” of equity, or as dealing not with jurisdiction but with the “right” to maintain an action, or have said that the defense under the equity rule is analogous to the defense that the plaintiff has no “title” and results in a dismissal “for want of equity.”

Those state decisions which held that a shareholder acquiring stock after the event may maintain a derivative action are founded on the view that it is a right belonging to the shareholder at the time of the transaction and which passes as a right to the subsequent purchaser. See Pollitz v. Gould (1911) 202 N.Y. 11.

The first case arising after the decision in Erie R. Co. v. Tompkins, in which this problem was involved, was Summers v. Hearst (S.D.N.Y. 1938) 23 F.Supp. 986. It concerned [former] Equity Rule 27, as Federal Rule 23 was not then in effect. In a well considered opinion Judge Leibell reviewed the decisions and said: “The federal cases that discuss this section of Rule 27 support the view that it states a principle of substantive law.” He quoted Pollitz v. Gould (1911) 202 N.Y. 11, as saying that the United States Supreme Court “seems to have been more concerned with establishing this rule as one of practice than of substantive law” but that “whether it be regarded as establishing a principle of law or a rule of practice, this authority has been subsequently followed in the United States courts.”

He then concluded that, although the federal decisions treat the equity rule as “stating a principle of substantive law”, if [former] “Equity Rule 27 is to be modified or revoked in view of Erie R. Co. v. Tompkins, it is not the province of this Court to suggest it, much less impliedly to follow that course by disregarding the mandatory provisions of the Rule.”

Some other federal decisions since 1938 touch the question.

In Piccard v. Sperry Corporation (S.D.N.Y. 1941) 36 F.Supp. 1006, 1009–10, affirmed without opinion (C.C.A.2d, 1941) 120 F.(2d) 328, a shareholder, not such at the time of the transactions complained of, sought to intervene. The court held an intervenor was as much subject to Rule 23 as an original plaintiff; and that the requirement of Rule 23(b) was “a matter of practice,” not substance, and applied in New York where the state law was otherwise, despite Erie R. Co. v. Tompkins. In York v. Guaranty Trust Co. of New York (C.C.A.2d, 1944) 143 F.(2d) 503, rev'd on other grounds (1945) 65 S.Ct. 1464, the court said: “Restrictions on the bringing of stockholders’ actions, such as those imposed by F.R.C.P. 23 (b) or other state statutes are procedural,” citing the Piccard and other cases.

In Gallup v. Caldwell (C.C.A.3d, 1941) 120 F.(2d) 90, 95, arising in New Jersey, the point was raised but not decided, the court saying that it was not satisfied that the then New Jersey rule differed from Rule 23(b), and that “under the circumstances the proper course was to follow Rule 23(b).”

In Mullins v. De Soto Securities Co. (W.D.La. 1942) 45 F.Supp. 871, 878, the point was not decided, because the court found the Louisiana rule to be the same as that stated in Rule 23(b).

In Toebelman v. Missouri-Kansas Pipe Line Co. (D.Del. 1941) 41 F.Supp. 334, 340, the court dealt only with another part of Rule 23(b), relating to prior demands on the stockholders and did not discuss Erie R. Co. v. Tompkins, or its effect on the rule.

In Perrott v. United States Banking Corp. (D.Del. 1944) 53 F.Supp. 953, it appeared that the Delaware law does not require the plaintiff to have owned shares at the time of the transaction complained of. The court sustained Rule 23(b), after discussion of the authorities, saying:

“It seems to me the rule does not go beyond procedure. * * * Simply because a particular plaintiff cannot qualify as a proper party to maintain such an action does not destroy or even whittle at the cause of action. The cause of action exists until a qualified plaintiff can get it started in a federal court.”

In Bankers Nat. Corp. v. Barr (S.D.N.Y. 1945) 9 Fed.Rules Serv. 23b.11, Case 1, the court held Rule 23(b) to be one of procedure, but that whether the plaintiff was a stockholder was a substantive question to be settled by state law.

The New York rule, as stated in Pollitz v. Gould, supra, has been altered by an act of the New York Legislature (Chapter 667, Laws of 1944, effective April 9, 1944, General Corporation Law, §61) which provides that “in any action brought by a shareholder in the right of a . . . corporation, it must appear that the plaintiff was a stockholder at the time of the transaction of which he complains, or that his stock thereafter devolved upon him by operation of law.” At the same time a further and separate provision was enacted, requiring under certain circumstances the giving of security for reasonable expenses and attorney's fees, to which security the corporation in whose right the action is brought and the defendants therein may have recourse. (Chapter 668, Laws of 1944, effective April 9, 1944, General Corporation Law, §61–b.) These provisions are aimed at so-called “strike” stockholders’ suits and their attendant abuses. Shielcrawt v. Moffett (Ct.App. 1945) 294 N.Y. 180, 61 N.E.(2d) 435, rev'g 51 N.Y.S.(2d) 188, aff'g 49 N.Y.S.(2d) 64; Noel Associates, Inc. v. Merrill (Sup.Ct. 1944) 184 Misc. 646, 53 N.Y.S.(2d) 143.

Insofar as §61 is concerned, it has been held that the section is procedural in nature. Klum v. Clinton Trust Co. (Sup.Ct. 1944) 183 Misc. 340, 48 N.Y.S.(2d) 267; Noel Associates, Inc. v. Merrill, supra. In the latter case the court pointed out that “The 1944 amendment to Section 61 rejected the rule laid down in the Pollitz case and substituted, in place thereof, in its precise language, the rule which has long prevailed in the Federal Courts and which is now Rule 23(b) . . .” There is, nevertheless, a difference of opinion regarding the application of the statute to pending actions. See Klum v. Clinton Trust Co., supra (applicable); Noel Associates, Inc. v. Merrill, supra (inapplicable).

With respect to §61–b, which may be regarded as a separate problem (Noel Associates, Inc. v. Merrill, supra), it has been held that even though the statute is procedural in nature—a matter not definitely decided—the Legislature evinced no intent that the provision should apply to actions pending when it became effective. Shielcrawt v. Moffett, supra. As to actions instituted after the effective date of the legislation, the constitutionality of §61–b is in dispute. See Wolf v. Atkinson (Sup.Ct. 1944) 182 Misc. 675, 49 N.Y.S.(2d) 703 (constitutional); Citron v. Mangel Stores Corp. (Sup.Ct. 1944) — Misc. —, 50 N.Y.S.(2d) 416 (unconstitutional); Zlinkoff, The American Investor and the Constitutionality of Section 61–B of the New York General Corporation Law (1945) 54 Yale L.J. 352.

New Jersey also enacted a statute, similar to Chapters 667 and 668 of the New York law. See P.L. 1945, Ch. 131, R.S.Cum.Supp. 14:3–15. The New Jersey provision similar to Chapter 668 (§61–b) differs, however, in that it specifically applies retroactively. It has been held that this provision is procedural and hence will not govern a pending action brought against a New Jersey corporation in the New York courts. Shielcrawt v. Moffett (Sup.Ct.N.Y. 1945) 184 Misc. 1074, 56 N.Y.S.(2d) 134.

See also generally, 2 Moore's Federal Practice (1938) 2250–2253, and Cum.Supplement §23.05.

The decisions here discussed show that the question is a debatable one, and that there is respectable authority for either view, with a recent trend towards the view that Rule 23(b)(1) is procedural. There is reason to say that the question is one which should not be decided by the Supreme Court ex parte, but left to await a judicial decision in a litigated case, and that in the light of the material in this note, the only inference to be drawn from a failure to amend Rule 23(b) would be that the question is postponed to await a litigated case.

The Advisory Committee is unanimously of the opinion that this course should be followed.

If, however, the final conclusion is that the rule deals with a matter of substantive right, then the rule should be amended by adding a provision that Rule 23(b)(1) does not apply in jurisdictions where state law permits a shareholder to maintain a secondary action, although he was not a shareholder at the time of the transactions of which he complains.

Notes of Advisory Committee on Rules—1966 Amendment

Difficulties with the original rule. The categories of class actions in the original rule were defined in terms of the abstract nature of the rights involved: the so-called “true” category was defined as involving “joint, common, or secondary rights”; the “hybrid” category, as involving “several” rights related to “specific property”; the “spurious” category, as involving “several” rights affected by a common question and related to common relief. It was thought that the definitions accurately described the situations amendable to the class-suit device, and also would indicate the proper extent of the judgment in each category, which would in turn help to determine the res judicata effect of the judgment if questioned in a later action. Thus the judgments in “true” and “hybrid” class actions would extend to the class (although in somewhat different ways); the judgment in a “spurious” class action would extend only to the parties including intervenors. See Moore, Federal Rules of Civil Procedure: Some Problems Raised by the Preliminary Draft, 25 Geo.L.J. 551, 570–76 (1937).

In practice, the terms “joint,” “common,” etc., which were used as the basis of the Rule 23 classification proved obscure and uncertain. See Chaffee, Some Problems of Equity 245–46, 256–57 (1950); Kalven & Rosenfield, The Contemporary Function of the Class Suit, 8 U. of Chi.L.Rev. 684, 707 & n. 73 (1941); Keeffe, Levy & Donovan, Lee Defeats Ben Hur, 33 Corn.L.Q. 327, 329–36 (1948); Developments in the Law: Multiparty Litigation in the Federal Courts, 71 Harv.L.Rev. 874, 931 (1958); Advisory Committee's Note to Rule 19, as amended. The courts had considerable difficulty with these terms. See, e.g., Gullo v. Veterans’ Coop. H. Assn., 13 F.R.D. 11 (D.D.C. 1952); Shipley v. Pittsburgh & L. E. R. Co., 70 F.Supp. 870 (W.D.Pa. 1947); Deckert v. Independence Shares Corp., 27 F.Supp. 763 (E.D.Pa. 1939), rev'd, 108 F.2d 51 (3d Cir. 1939), rev'd, 311 U.S. 282 (1940), on remand, 39 F.Supp. 592 (E.D.Pa. 1941), rev'd sub nom. Pennsylvania Co. for Ins. on Lives v. Deckert, 123 F.2d 979 (3d Cir. 1941) (see Chafee, supra, at 264–65).

Nor did the rule provide an adequate guide to the proper extent of the judgments in class actions. First, we find instances of the courts classifying actions as “true” or intimating that the judgments would be decisive for the class where these results seemed appropriate but were reached by dint of depriving the word “several” of coherent meaning. See, e.g., System Federation No. 91 v. Reed, 180 F.2d 991 (6th Cir. 1950); Wilson v. City of Paducah, 100 F.Supp. 116 (W.D.Ky. 1951); Citizens Banking Co. v. Monticello State Bank, 143 F.2d 261 (8th Cir. 1944); Redmond v. Commerce Trust Co., 144 F.2d 140 (8th Cir. 1944), cert. denied, 323 U.S. 776 (1944); United States v. American Optical Co., 97 F.Supp. 66 (N.D.Ill. 1951); National Hairdressers’ & C. Assn. v. Philad. Co., 34 F.Supp. 264 (D.Del. 1940); 41 F.Supp. 701 (D.Del. 1940), aff'd mem., 129 F.2d 1020 (3d Cir. 1942). Second, we find cases classified by the courts as “spurious” in which, on a realistic view, it would seem fitting for the judgments to extend to the class. See, e.g., Knapp v. Bankers Sec. Corp., 17 F.R.D. 245 (E.D.Pa. 1954); aff'd 230 F.2d 717 (3d Cir. 1956); Giesecke v. Denver Tramway Corp., 81 F.Supp. 957 (D.Del. 1949); York v. Guaranty Trust Co., 143 F.2d 503 (2d Cir. 1944), rev'd on grounds not here relevant, 326 U.S. 90 (1945) (see Chafee, supra, at 208); cf. Webster Eisenlohr, Inc. v. Kalodner, 145 F.2d 316, 320 (3d Cir. 1944), cert. denied, 325 U.S. 807 (1945). But cf. the early decisions, Duke of Bedford v. Ellis [1901], A.C. 1; Sheffield Waterworks v. Yeomans, L.R. 2 Ch.App. 8 (1866); Brown v. Vermuden, 1 Ch.Cas. 272, 22 Eng.Rep. 796 (1676).

The “spurious” action envisaged by original Rule 23 was in any event an anomaly because, although denominated a “class” action and pleaded as such, it was supposed not to adjudicate the rights or liabilities of any person not a party. It was believed to be an advantage of the “spurious” category that it would invite decisions that a member of the “class” could, like a member of the class in a “true” or “hybrid” action, intervene on an ancillary basis without being required to show an independent basis of Federal jurisdiction, and have the benefit of the date of the commencement of the action for purposes of the statute of limitations. See 3 Moore's Federal Practice, pars. 23.10[1], 23.12 (2d ed. 1963). These results were attained in some instances but not in others. On the statute of limitations, see Union Carbide & Carbon Corp. v. Nisley, 300 F.2d 561 (10th Cir. 1961), pet. cert. dism., 371 U.S. 801 (1963); but cf. P. W. Husserl, Inc. v. Newman, 25 F.R.D. 264 (S.D.N.Y. 1960); Athas v. Day, 161 F.Supp. 916 (D.Colo. 1958). On ancillary intervention, see Amen v. Black, 234 F.2d 12 (10th Cir. 1956), cert. granted, 352 U.S. 888 (1956), dism. on stip., 355 U.S. 600 (1958); but. cf. Wagner v. Kemper, 13 F.R.D. 128 (W.D.Mo. 1952). The results, however, can hardly depend upon the mere appearance of a “spurious” category in the rule; they should turn no more basic considerations. See discussion of subdivision (c)(1) below.

Finally, the original rule did not squarely address itself to the question of the measures that might be taken during the course of the action to assure procedural fairness, particularly giving notice to members of the class, which may in turn be related in some instances to the extension of the judgment to the class. See Chafee, supra, at 230–31; Keeffe, Levy & Donovan, supra; Developments in the Law, supra, 71 Harv.L.Rev. at 937–38; Note, Binding Effect of Class Actions, 67 Harv.L.Rev. 1059, 1062–65 (1954); Note, Federal Class Actions: A Suggested Revision of Rule 23, 46 Colum.L.Rev. 818, 833–36 (1946); Mich.Gen.Court R. 208.4 (effective Jan. 1, 1963); Idaho R.Civ.P. 23(d); Minn.R.Civ.P. 23.04; N.Dak.R.Civ.P. 23(d).

The amended rule describes in more practical terms the occasions for maintaining class actions; provides that all class actions maintained to the end as such will result in judgments including those whom the court finds to be members of the class, whether or not the judgment is favorable to the class; and refers to the measures which can be taken to assure the fair conduct of these actions.

Subdivision (a) states the prerequisites for maintaining any class action in terms of the numerousness of the class making joinder of the members impracticable, the existence of questions common to the class, and the desired qualifications of the representative parties. See Weinstein, Revision of Procedure; Some Problems in Class Actions, 9 Buffalo L.Rev. 433, 458–59 (1960); 2 Barron & Holtzoff, Federal Practice & Procedure §562, at 265, §572, at 351–52 (Wright ed. 1961). These are necessary but not sufficient conditions for a class action. See, e.g., Giordano v. Radio Corp. of Am., 183 F.2d 558, 560 (3d Cir. 1950); Zachman v. Erwin, 186 F.Supp. 681 (S.D.Tex. 1959); Baim & Blank, Inc. v. Warren Connelly Co., Inc., 19 F.R.D. 108 (S.D.N.Y. 1956). Subdivision (b) describes the additional elements which in varying situations justify the use of a class action.

Subdivision (b)(1). The difficulties which would be likely to arise if resort were had to separate actions by or against the individual members of the class here furnish the reasons for, and the principal key to, the propriety and value of utilizing the class-action device. The considerations stated under clauses (A) and (B) are comparable to certain of the elements which define the persons whose joinder in an action is desirable as stated in Rule 19(a), as amended. See amended Rule 19(a)(2)(i) and (ii), and the Advisory Committee's Note thereto; Hazard, Indispensable Party; The Historical Origin of a Procedural Phantom, 61 Colum.L.Rev. 1254, 1259–60 (1961); cf. 3 Moore, supra, par. 23.08, at 3435.

Clause (A): One person may have rights against, or be under duties toward, numerous persons constituting a class, and be so positioned that conflicting or varying adjudications in lawsuits with individual members of the class might establish incompatible standards to govern his conduct. The class action device can be used effectively to obviate the actual or virtual dilemma which would thus confront the party opposing the class. The matter has been stated thus: “The felt necessity for a class action is greatest when the courts are called upon to order or sanction the alteration of the status quo in circumstances such that a large number of persons are in a position to call on a single person to alter the status quo, or to complain if it is altered, and the possibility exists that [the] actor might be called upon to act in inconsistent ways.” Louisell & Hazard, Pleading and Procedure; State and Federal 719 (1962); see Supreme Tribe of Ben-Hur v. Cauble, 255 U.S. 356, 366 –67 (1921). To illustrate: Separate actions by individuals against a municipality to declare a bond issue invalid or condition or limit it, to prevent or limit the making of a particular appropriation or to compel or invalidate an assessment, might create a risk of inconsistent or varying determinations. In the same way, individual litigations of the rights and duties of riparian owners, or of landowners’ rights and duties respecting a claimed nuisance, could create a possibility of incompatible adjudications. Actions by or against a class provide a ready and fair means of achieving unitary adjudication. See Maricopa County Mun. Water Con. Dist. v. Looney, 219 F.2d 529 (9th Cir. 1955); Rank v. Krug, 142 F.Supp. 1, 154–59 (S.D.Calif. 1956), on app., State of California v. Rank, 293 F.2d 340, 348 (9th Cir. 1961); Gart v. Cole, 263 F.2d 244 (2d Cir. 1959), cert. denied 359 U.S. 978 (1959); cf. Martinez v. Maverick Cty. Water Con. & Imp. Dist., 219 F.2d 666 (5th Cir. 1955); 3 Moore, supra, par. 23.11[2], at 3458–59.

Clause (B): This clause takes in situations where the judgment in a nonclass action by or against an individual member of the class, while not technically concluding the other members, might do so as a practical matter. The vice of an individual actions would lie in the fact that the other members of the class, thus practically concluded, would have had no representation in the lawsuit. In an action by policy holders against a fraternal benefit association attacking a financial reorganization of the society, it would hardly have been practical, if indeed it would have been possible, to confine the effects of a validation of the reorganization to the individual plaintiffs. Consequently a class action was called for with adequate representation of all members of the class. See Supreme Tribe of Ben-Hur v. Cauble, 255 U.S. 356 (1921); Waybright v. Columbian Mut. Life Ins. Co., 30 F.Supp. 885 (W.D.Tenn. 1939); cf. Smith v. Swormstedt, 16 How. (57 U.S.) 288 (1853). For much the same reason actions by shareholders to compel the declaration of a dividend the proper recognition and handling of redemption or pre-emption rights, or the like (or actions by the corporation for corresponding declarations of rights), should ordinarily be conducted as class actions, although the matter has been much obscured by the insistence that each shareholder has an individual claim. See Knapp v. Bankers Securities Corp., 17 F.R.D. 245 (E.D.Pa. 1954), aff'd, 230 F.2d 717 (3d Cir. 1956); Giesecke v. Denver Tramway Corp., 81 F.Supp. 957 (D.Del. 1949); Zahn v. Transamerica Corp., 162 F.2d 36 (3d Cir. 1947); Speed v. Transamerica Corp., 100 F.Supp. 461 (D.Del. 1951); Sobel v. Whittier Corp., 95 F.Supp. 643 (E.D.Mich. 1951), app. dism., 195 F.2d 361 (6th Cir. 1952); Goldberg v. Whittier Corp., 111 F.Supp. 382 (E.D.Mich. 1953); Dann v. Studebaker-Packard Corp., 288 F.2d 201 (6th Cir. 1961); Edgerton v. Armour & Co., 94 F.Supp. 549 (S.D.Calif. 1950); Ames v. Mengel Co., 190 F.2d 344 (2d Cir. 1951). (These shareholders’ actions are to be distinguished from derivative actions by shareholders dealt with in new Rule 23.1). The same reasoning applies to an action which charges a breach of trust by an indenture trustee or other fiduciary similarly affecting the members of a large class of security holders or other beneficiaries, and which requires an accounting or like measures to restore the subject of the trust. See Bosenberg v. Chicago T. & T. Co., 128 F.2d 245 (7th Cir. 1942); Citizens Banking Co. v. Monticello State Bank, 143 F.2d 261 (8th Cir. 1944); Redmond v. Commerce Trust Co., 144 F.2d 140 (8th Cir. 1944), cert. denied, 323 U.S. 776 (1944); cf. York v. Guaranty Trust Co., 143 F.2d 503 (2d Cir. 1944), rev'd on grounds not here relevant, 326 U.S. 99 (1945).

In various situations an adjudication as to one or more members of the class will necessarily or probably have an adverse practical effect on the interests of other members who should therefore be represented in the lawsuit. This is plainly the case when claims are made by numerous persons against a fund insufficient to satisfy all claims. A class action by or against representative members to settle the validity of the claims as a whole, or in groups, followed by separate proof of the amount of each valid claim and proportionate distribution of the fund, meets the problem. Cf. Dickinson v. Burnham, 197 F.2d 973 (2d Cir. 1952), cert. denied, 344 U.S. 875 (1952); 3 Moore, supra, at par. 23.09. The same reasoning applies to an action by a creditor to set aside a fraudulent conveyance by the debtor and to appropriate the property to his claim, when the debtor's assets are insufficient to pay all creditors’ claims. See Hefferman v. Bennett & Armour, 110 Cal.App.2d 564, 243 P.2d 846 (1952); cf. City & County of San Francisco v. Market Street Ry., 95 Cal.App.2d 648, 213 P.2d 780 (1950). Similar problems, however, can arise in the absence of a fund either present or potential. A negative or mandatory injunction secured by one of a numerous class may disable the opposing party from performing claimed duties toward the other members of the class or materially affect his ability to do so. An adjudication as to movie “clearances and runs” nominally affecting only one exhibitor would often have practical effects on all the exhibitors in the same territorial area. Cf. United States v. Paramount Pictures, Inc., 66 F.Supp. 323, 341–46 (S.D.N.Y. 1946); 334 U.S. 131, 144 –48 (1948). Assuming a sufficiently numerous class of exhibitors, a class action would be advisable. (Here representation of subclasses of exhibitors could become necessary; see subdivision (c)(3)(B).)

Subdivision (b)(2). This subdivision is intended to reach situations where a party has taken action or refused to take action with respect to a class, and final relief of an injunctive nature or of a corresponding declaratory nature, settling the legality of the behavior with respect to the class as a whole, is appropriate. Declaratory relief “corresponds” to injunctive relief when as a practical matter it affords injunctive relief or serves as a basis for later injunctive relief. The subdivision does not extend to cases in which the appropriate final relief relates exclusively or predominantly to money damages. Action or inaction is directed to a class within the meaning of this subdivision even if it has taken effect or is threatened only as to one or a few members of the class, provided it is based on grounds which have general application to the class.

Illustrative are various actions in the civil-rights field where a party is charged with discriminating unlawfully against a class, usually one whose members are incapable of specific enumeration. See Potts v. Flax, 313 F.2d 284 (5th Cir. 1963); Bailey v. Patterson, 323 F.2d 201 (5th Cir. 1963), cert. denied, 377 U.S. 972 (1964); Brunson v. Board of Trustees of School District No. 1, Clarendon City, S.C., 311 F.2d 107 (4th Cir. 1962), cert. denied, 373 U.S. 933 (1963); Green v. School Bd. of Roanoke, Va., 304 F.2d 118 (4th Cir. 1962); Orleans Parish School Bd. v. Bush, 242 F.2d 156 (5th Cir. 1957), cert. denied, 354 U.S. 921 (1957); Mannings v. Board of Public Inst. of Hillsborough County, Fla., 277 F.2d 370 (5th Cir. 1960); Northcross v. Board of Ed. of City of Memphis, 302 F.2d 818 (6th Cir. 1962), cert. denied 370 U.S. 944 (1962); Frasier v. Board of Trustees of Univ. of N.C., 134 F.Supp. 589 (M.D.N.C. 1955, 3-judge court), aff'd, 350 U.S. 979 (1956). Subdivision (b)(2) is not limited to civil-rights cases. Thus an action looking to specific or declaratory relief could be brought by a numerous class of purchasers, say retailers of a given description, against a seller alleged to have undertaken to sell to that class at prices higher than those set for other purchasers, say retailers of another description, when the applicable law forbids such a pricing differential. So also a patentee of a machine, charged with selling or licensing the machine on condition that purchasers or licensees also purchase or obtain licenses to use an ancillary unpatented machine, could be sued on a class basis by a numerous group of purchasers or licensees, or by a numerous group of competing sellers or licensors of the unpatented machine, to test the legality of the “tying” condition.

Subdivision (b)(3). In the situations to which this subdivision relates, class-action treatment is not as clearly called for as in those described above, but it may nevertheless be convenient and desirable depending upon the particular facts. Subdivision (b)(3) encompasses those cases in which a class action would achieve economies of time, effort, and expense, and promote, uniformity of decision as to persons similarly situated, without sacrificing procedural fairness or bringing about other undesirable results. Cf. Chafee, supra, at 201.

The court is required to find, as a condition of holding that a class action may be maintained under this subdivision, that the questions common to the class predominate over the questions affecting individual members. It is only where this predominance exists that economies can be achieved by means of the class-action device. In this view, a fraud perpetrated on numerous persons by the use of similar misrepresentations may be an appealing situation for a class action, and it may remain so despite the need, if liability is found, for separate determination of the damages suffered by individuals within the class. On the other hand, although having some common core, a fraud case may be unsuited for treatment as a class action if there was material variation in the representation made or in the kinds or degrees of reliance by the persons to whom they were addressed. See Oppenheimer v. F. J. Young & Co., Inc., 144 F.2d 387 (2d Cir. 1944); Miller v. National City Bank of N.Y., 166 F.2d 723 (2d Cir. 1948); and for like problems in other contexts, see Hughes v. Encyclopaedia Brittanica, 199 F.2d 295 (7th Cir. 1952); Sturgeon v. Great Lakes Steel Corp., 143 F.2d 819 (6th Cir. 1944). A “mass accident” resulting in injuries to numerous persons is ordinarily not appropriate for a class action because of the likelihood that significant questions, not only of damages but of liability and defenses of liability, would be present, affecting the individuals in different ways. In these circumstances an action conducted nominally as a class action would degenerate in practice into multiple lawsuits separately tried. See Pennsylvania R.R. v. United States, 111 F.Supp. 80 (D.N.J. 1953); cf. Weinstein, supra, 9 Buffalo L.Rev. at 469. Private damage claims by numerous individuals arising out of concerted antitrust violations may or may not involve predominating common questions. See Union Carbide & Carbon Corp. v. Nisley, 300 F.2d 561 (10th Cir. 1961), pet. cert. dism., 371 U.S. 801 (1963); cf. Weeks v. Bareco Oil Co., 125 F.2d 84 (7th Cir. 1941); Kainz v. Anheuser-Busch, Inc., 194 F.2d 737 (7th Cir. 1952); Hess v. Anderson, Clayton & Co., 20 F.R.D. 466 (S.D.Calif. 1957).

That common questions predominate is not itself sufficient to justify a class action under subdivision (b)(3), for another method of handling the litigious situation may be available which has greater practical advantages. Thus one or more actions agreed to by the parties as test or model actions may be preferable to a class action; or it may prove feasible and preferable to consolidate actions. Cf. Weinstein, supra, 9 Buffalo L.Rev. at 438–54. Even when a number of separate actions are proceeding simultaneously, experience shows that the burdens on the parties and the courts can sometimes be reduced by arrangements for avoiding repetitious discovery or the like. Currently the Coordinating Committee on Multiple Litigation in the United States District Courts (a subcommittee of the Committee on Trial Practice and Technique of the Judicial Conference of the United States) is charged with developing methods for expediting such massive litigation. To reinforce the point that the court with the aid of the parties ought to assess the relative advantages of alternative procedures for handling the total controversy, subdivision (b)(3) requires, as a further condition of maintaining the class action, that the court shall find that that procedure is “superior” to the others in the particular circumstances.

Factors (A)–(D) are listed, non-exhaustively, as pertinent to the findings. The court is to consider the interests of individual members of the class in controlling their own litigations and carrying them on as they see fit. See Weeks v. Bareco Oil Co., 125 F.2d 84, 88–90, 93–94 (7th Cir. 1941) (anti-trust action); see also Pentland v. Dravo Corp., 152 F.2d 851 (3d Cir. 1945), and Chaffee, supra, at 273–75, regarding policy of Fair Labor Standards Act of 1938, §16(b), 29 U.S.C. §216(b), prior to amendment by Portal-to-Portal Act of 1947, §5(a). [The present provisions of 29 U.S.C. §216(b) are not intended to be affected by Rule 23, as amended.]

In this connection the court should inform itself of any litigation actually pending by or against the individuals. The interests of individuals in conducting separate lawsuits may be so strong as to call for denial of a class action. On the other hand, these interests may be theoretic rather than practical; the class may have a high degree of cohesion and prosecution of the action through representatives would be quite unobjectionable, or the amounts at stake for individuals may be so small that separate suits would be impracticable. The burden that separate suits would impose on the party opposing the class, or upon the court calendars, may also fairly be considered. (See the discussion, under subdivision (c)(2) below, of the right of members to be excluded from the class upon their request.)

Also pertinent is the question of the desirability of concentrating the trial of the claims in the particular forum by means of a class action, in contrast to allowing the claims to be litigated separately in forums to which they would ordinarily be brought. Finally, the court should consider the problems of management which are likely to arise in the conduct of a class action.

Subdivision (c)(1). In order to give clear definition to the action, this provision requires the court to determine, as early in the proceedings as may be practicable, whether an action brought as a class action is to be so maintained. The determination depends in each case on satisfaction of the terms of subdivision (a) and the relevant provisions of subdivision (b).

An order embodying a determination can be conditional; the court may rule, for example, that a class action may be maintained only if the representation is improved through intervention of additional parties of a stated type. A determination once made can be altered or amended before the decision on the merits if, upon fuller development of the facts, the original determination appears unsound. A negative determination means that the action should be stripped of its character as a class action. See subdivision (d)(4). Although an action thus becomes a nonclass action, the court may still be receptive to interventions before the decision on the merits so that the litigation may cover as many interests as can be conveniently handled; the questions whether the intervenors in the nonclass action shall be permitted to claim “ancillary” jurisdiction or the benefit of the date of the commencement of the action for purposes of the statute of limitations are to be decided by reference to the laws governing jurisdiction and limitations as they apply in particular contexts.

Whether the court should require notice to be given to members of the class of its intention to make a determination, or of the order embodying it, is left to the court's discretion under subdivision (d)(2).

Subdivision (c)(2) makes special provision for class actions maintained under subdivision (b)(3). As noted in the discussion of the latter subdivision, the interests of the individuals in pursuing their own litigations may be so strong here as to warrant denial of a class action altogether. Even when a class action is maintained under subdivision (b)(3), this individual interest is respected. Thus the court is required to direct notice to the members of the class of the right of each member to be excluded from the class upon his request. A member who does not request exclusion may, if he wishes, enter an appearance in the action through his counsel; whether or not he does so, the judgment in the action will embrace him.

The notice setting forth the alternatives open to the members of the class, is to be the best practicable under the circumstances, and shall include individual notice to the members who can be identified through reasonable effort. (For further discussion of this notice, see the statement under subdivision (d)(2) below.)

Subdivision (c)(3). The judgment in a class action maintained as such to the end will embrace the class, that is, in a class action under subdivision (b)(1) or (b)(2), those found by the court to be class members; in a class action under subdivision (b)(3), those to whom the notice prescribed by subdivision (c)(2) was directed, excepting those who requested exclusion or who are ultimately found by the court not to be members of the class. The judgment has this scope whether it is favorable or unfavorable to the class. In a (b)(1) or (b)(2) action the judgment “describes” the members of the class, but need not specify the individual members; in a (b)(3) action the judgment “specifies” the individual members who have been identified and described the others.

Compare subdivision (c)(4) as to actions conducted as class actions only with respect to particular issues. Where the class-action character of the lawsuit is based solely on the existence of a “limited fund,” the judgment, while extending to all claims of class members against the fund, has ordinarily left unaffected the personal claims of nonappearing members against the debtor. See 3 Moore, supra, par. 23.11[4].

Hitherto, in a few actions conducted as “spurious” class actions and thus nominally designed to extend only to parties and others intervening before the determination of liability, courts have held or intimated that class members might be permitted to intervene after a decision on the merits favorable to their interests, in order to secure the benefits of the decision for themselves, although they would presumably be unaffected by an unfavorable decision. See, as to the propriety of this so-called “one-way” intervention in “spurious” actions, the conflicting views expressed in Union Carbide & Carbon Corp. v. Nisley, 300 F.2d 561 (10th Cir. 1961), pet. cert. dism., 371 U.S. 801 (1963); York v. Guaranty Trust Co., 143 F.2d 503, 529 (2d Cir. 1944), rev'd on grounds not here relevant, 326 U.S. 99 (1945); Pentland v. Dravo Corp., 152 F.2d 851, 856 (3d Cir. 1945); Speed v. Transamerica Corp., 100 F.Supp. 461, 463 (D.Del. 1951); State Wholesale Grocers v. Great Atl. & Pac. Tea Co., 24 F.R.D. 510 (N.D.Ill. 1959); Alabama Ind. Serv. Stat. Assn. v. Shell Pet Corp., 28 F.Supp. 386, 390 (N.D.Ala. 1939); Tolliver v. Cudahy Packing Co., 39 F.Supp. 337, 339 (E.D.Tenn. 1941); Kalven & Rosenfield, supra, 8 U. of Chi.L.Rev. 684 (1941); Comment, 53 Nw.U.L.Rev. 627, 632–33 (1958); Developments in the Law, supra, 71 Harv.L.Rev. at 935; 2 Barron & Holtzoff, supra, §568; but cf. Lockwood v. Hercules Powder Co., 7 F.R.D. 24, 28–29 (W.D.Mo. 1947); Abram v. San Joaquin Cotton Oil Co., 46 F.Supp. 969, 976–77 (S.D.Calif. 1942); Chaffee, supra, at 280, 285; 3 Moore, supra, par. 23.12, at 3476. Under proposed subdivision (c)(3), one-way intervention is excluded; the action will have been early determined to be a class or nonclass action, and in the former case the judgment, whether or not favorable, will include the class, as above stated.

Although thus declaring that the judgment in a class action includes the class, as defined, subdivision (c)(3) does not disturb the recognized principle that the court conducting the action cannot predetermine the res judicata effect of the judgment; this can be tested only in a subsequent action. See Restatement, Judgments §86, comment (h), §116 (1942). The court, however, in framing the judgment in any suit brought as a class action, must decide what its extent or coverage shall be, and if the matter is carefully considered, questions of res judicata are less likely to be raised at a later time and if raised will be more satisfactorily answered. See Chafee, supra, at 294; Weinstein, supra, 9 Buffalo L.Rev. at 460.

Subdivision (c)(4). This provision recognizes that an action may be maintained as a class action as to particular issues only. For example, in a fraud or similar case the action may retain its “class” character only through the adjudication of liability to the class; the members of the class may thereafter be required to come in individually and prove the amounts of their respective claims.

Two or more classes may be represented in a single action. Where a class is found to include subclasses divergent in interest, the class may be divided correspondingly, and each subclass treated as a class.

Subdivision (d) is concerned with the fair and efficient conduct of the action and lists some types of orders which may be appropriate.

The court should consider how the proceedings are to be arranged in sequence, and what measures should be taken to simplify the proof and argument. See subdivision (d)(1). The orders resulting from this consideration, like the others referred to in subdivision (d), may be combined with a pretrial order under Rule 16, and are subject to modification as the case proceeds.

Subdivision (d)(2) sets out a non-exhaustive list of possible occasions for orders requiring notice to the class. Such notice is not a novel conception. For example, in “limited fund” cases, members of t