opinion: Mr. Justice Powell
  delivered the opinion of the Court.
  This case presents two questions: -first, whether the National Labor Relations Board properly determined that all “managerial employees/’ except those whose participation in a labor organization would create a conflict of interest with their job responsibilities, are covered by the National Labor Relations Act; and second, whether the Board must proceed by rulemaking rather than by adjudication in determining whether certain buyers are “managerial employees.” We answer both questions in the negative.
  I
  Respondent Bell Aerospace Co., Division of Textron, Inc. (company), operates a plant in Wheatfield, New York, where it is engaged in research and development in the design and fabrication of aerospace products. On July 30, 1970, Amalgamated Local No. 1286 of the United Automobile, Aerospace and Agricultural Implement Workers of America (union) petitioned the National Labor Relations Board (Board) for a representation election to determine whether the union would be certified as the bargaining representative of the 25 buyers in the purchasing and procurement department at the company’s plant. The company opposed the petition on the ground that the buyers were “managerial’ employees” and thus were not covered by the Act.
  The relevant facts adduced at the representation hearing are as follows. The purchasing and procurement department receives requisition orders from other departments at the plant and is responsible for purchasing all of the company’s needs from outside suppliers. Some items are standardized and may be purchased “off the' shelf” from various distributors .and suppliers. Other items must be made to the company’s specifications, and the requisition orders may be accompanied by detailed blueprints and other technical plans. Requisitions often designate a particular vendor, and in some instances the buyer must obtain approval before selecting a different one. Where no vendor is specified, the buyer is free to choose-one.
  Absent specific instructions to the 'contrary, buyers have full- discretion, without any dollar limit, to select' prospective, vendors, draft invitations to bid, evaluate submitted bids, negotiate price and terms, and prepare purchase orders. Buyers execute all purchase orders up to $50,000, They may place or cancel orders of less than $5,000 on their own signature. ’ On commitments in excess of $5,000, buyers must' obtain the approval of a superior, with higher levels of approval required as the purchase cost increases. For the Minute Man missile project, which represents 70% of the company’s sales, purchase decisions are made by a team of personnel from the engineering, quality assurance, finance, and manufacturing departments. The buyer serves as team chairman and signs the purchase order, but a representative from the pricing and negotiation department participates in working out the terms.
  After the representation hearing, the Regional Director transferred the case to the Board. On. May 20, .1971, the Board issued its decision holding that the company’s buyers constituted an appropriate unit for purposes of collective bargaining and directing an election. 190 N. L. R. B. 431. Relying on its recent decision in North Arkansas Electric Cooperative, Inc., 185 N. L. R. B. 550 (1970), the Board first stated that even though the company’s buyers might be “managerial employees,” they were nevertheless covered by the Act and entitled to its protections^ The Board then rejected the company’s alternative contention that representation should be denied because the buyers’ authority to commit the company’s credit/ select vendors, and negotiate purchase prices would create a potential conflict of interest between the buyers as union members and the company. In essence, the company argued that buyers would be more receptive to bids from union contractors and would klso influence “make or buy” decisions in favor of “make,” thus creating additional work for sister unions in the plant. The Board thought, however, that-any possible conflict was “unsupported conjecture” since the buyérs’ “.discretion and latitude for independent action* must take place within the confines of the general directions which the Employer has established” and that “any possible temptation to allow sympathy for sister unions to influence such decisions could effectively be controlled by the Employer.” 190 N. L. R. B., at 431.
  On June 16, 1971, a representation election was conducted in which 15 of the buyers voted for the union and nine against. On August 12, the Board certified the union as the exclusive bargaining representative for the company’s buyers. That same day, ■ however, the Court of Appeals for the Eighth Circuit denied enforcement of another Board order in NLRB v. North Arkansas Electric Cooperative, Inc., 446 F. 2d 602, and held that “managerial employees” were not covered by the Act and were therefore not entitled to its protections. Ia., at 610.
  Encouraged by the Eighth Circuit’s decision, r,he company moved the Board for reconsideration of its earlier order. The Board denied the motion, 196 N. L. R. B. 827 (1972), stating that it disagreed with the Eighth Circuit and. would adhere to its'own decision in North Arkansas'. In the. Board’s view, Congress intended to excludé from the Act only those “managerial employees” associated with the “formulation and implementation of labor relations policies.” Id., at 828. In each case, the “fundamental touchstone” was “whether the duties and responsibilities of any managerial employee or group of managerial employees do or do not include determinations which should be made free of any conflict of interest which could arise if the person involved was a participating member of a labor organization.” Ibid. Turning to the present case, the Board reiterated,its prior finding that the company had not shown that union organization of its buyers would create a conflict of interest in labor relations.
  The company stood by its contention that the buyers, as “managerial employees,” were not covered by the Act and refused to bargain .with the union. An unfair labor practice complaint resulted in a Board finding that the company had violated §§ 8 (a) (5) and (1) of the Act, 29 U. S. C. §§ 158 (a)(5) and (1), and an order compelling the company to bargain with the union. 197 N. L. R. B. 209 (1972). Subsequently, the company petitioned the United States Court of Appeals for the Second .Circuit for review" of the order and the Board cross-petitioned for enforcement:
  The Court of Appeals denied enforcement. 475 F. 2d 485 (1973). After reviewing the legislative history'of the. Taft-Hartley Act of 1947, 61 Stat. 136, and the Board’s decisions in this area, the court concluded that Congress had intended to exclude all true “managerial employees” from the protection of the Act. . It explained that this “exclusion embraced not only an employee ‘so closely related to or aligned with management as to pla,ce the employee in a position of conflict of interest between his employer on the one hand and his fellow workers on the other’ but also one who is ‘formulating, determining and effectuating his employer’s policies or has discretion, independent of an employer’s established policy, in the performance of his duties,’ Illinois State Journal-Register, Inc. v. NLRB, 412 F. 2d 37, 41 (7 Cir. 1969).” 475 F. 2d, at 494. The court added, however, that “the Board would [not] be precluded, on proper proceedings, from determining that buyers, or some types of buyers, are not true ‘managerial employees’ and consequently come within the protection of § 8 (a)(5) and (1).” Ibid.
  Turning to the merits of the present case, the court acknowledged that there was substantial evidence that the company’s buyers were not sufficiently high in the managerial hierarchy to constitute true “managerial employees.” Nevertheless, the court denied enforcement for two reasons. First, it was not certain that the Board’s decision rested on a factual determination that these buyers' were not true “managerial employees” rather than .on “its new, and in our view, erroneous holding that it- was free to regard all managerial employees as covered by the Act unless their duties met” the conflict-of-interest touchstone. Id., a.t .494-495. Second, although the Board was not precluded from holding that buyers, or softie types of buyers, were not “managerial employees,” the court thought that, in view of the Board’s long line of cases holding the contrary, it could not accomplish this change of position by adjudication. Rather, the Board should conduct a rulemaking proceeding in, conformity with § 6 of the Act, 29 U. S. C. § 156. The court therefore remanded the case to the Board for such a proceeding.
  We granted the. Board’s petition for certiorari. 414 U. S. 816.
  II
  We begin with the question whether all “managerial employees,” rather than just those in positions susceptible to. conflicts of interest in labor relations, are excluded from the protections of the Act. The Board’s early decisions, the legislative history of the Taft-Hartley Act of 1947, 61 Stat. 136, and subsequent Board and court decisions provide the necessary guidance for our inquiry. In examining these authorities, we draw on several established principles of statutory construction. In addition to the importance of legislative history, a court may accord great weight to the longstanding interpretation placed on a statute by an agency charged with its administration. This is especially so where Congress has re-enacted the statute without pertinent change. In these circumstances, congressional failure to revise or repeal the agency’s interpretation is persuasive evidence that the interpretation is the one intended by Congress. We have also recognized that subsequent legislation declaring the intent of an earlier, statute is entitled to significant weight. Application of these principles-leads us to conclude, as did the Court of Appeals, that Congress intended to exclude from the protections of the Act all employees properly classified as “managerial.”
  A
  The Wagner Act, 49 Stat. 449, did not expressly mention the term “managerial employee.” After the Act’s passage, however, the Board developed the concept of “managerial employee” in a series of cases involving the appropriateness'of bargaining units. The first cases established that “managerial employees” were not to be included in a unit with rank-and-file employees. In Freiz & Sons, 47 N. L. R. B. 43, 47 (1943), for example, the Board excluded expediters from a proposed ■ unit of production and maintenance workers because they were “closely related to the management.” Similarly, in Spicer Mfg. Corp., 55 N. L. R. B. 1491, 1498 (1944), expediters were again excluded from a unit containing office, technical, clerical, and professional employees because “the authority possessed by [the expediters] to exercise their discretion in making commitments on behalf of the Company stamps them as. managerial.” This rationale was soon applied to buyers. See, e. g., Hudson Motor Car Co., 55 N. L. R. B. 509, 512 (1944); Vulcan Corp., 58 N. L. R. B. 733, 736 (1944); Barrett Division, Allied Chem. & Dye Corp., 65 N. L. R. B. 903, 905 (1946); Electric Controller & Mfg. Co., 69 N L. R. B. 1242, 1245-1246 (1946). The Board summarized its policy on “managerial employees” in Ford Motor Co., 66 N. L. R. B. 1317, 1322 (1946):
  “We have customarily excluded from bargaining units of rank and file workers executive employees who are in a position to formulate, determine and effectuate management policies. These employees we have considered and still deem to be ‘managerial/ in that they express and make operative the decisions of management.”
  Whether the Board regarded all “managerial employees” as entirely outside the protection of the Act, as well as inappropriate for inclusion in a rank-and-file bargaining unit, is less certain. To be sure, at no time did the Board certify even a separate unit of “managerial employees” or state that such was possible. The Board was cautious, however, in determining which employees were “managerial.” For example, in Dravo Corp., 54 N. L. R. B. 1174, 1177 (1944), the Board excluded buyers and expediters' from a unit of office and clerical employees, but reserved the question whether all such employees were to be considered “managerial”:
  “This is not to say, however, that buyers and expediters are to be denied the right to self-organization and to collective bargaining under the Act. The precise relationship of the buyers and expediters to management here is not now being determined by us.”
  - During this period the Board’s policy with respect to the related but narrower category of “supervisory employees” manifested a progressive uncertainty. The Board first excluded supervisors from units of rank-and-file employees, e. g., Mueller Brass Co., 39 N. L. R. B. 167, 171 (1942), but in Union Collieries Coal Co., 41 N. L. R. B. 961, supplemental decision, 44 N. L. R. B. 165. (1942), it certified a separate unit composed of supervisors who were to be represented by an independent union. Shortly thereafter, in Godchaux Sugars, Inc., 44 N. L. R. B. 874 (1942), the Board approved a unit of supervisors whose union was affiliated with a union of rank-and-file employees. This trend was soon halted, however, by Maryland Drydock Co., 49 N. L. R. B. 733 (1943), where the Board held that supervisors, although literally “employees” under the Act, could not be organized in any unit. And in Yale & Towne Mfg. Co., 60 N. L. R. B. 626, 628-629 (1945), the Board further held that timestudy men, whose “ ‘interests and functions’ ” were “ ‘sufficiently akin to those of management,’ ” should neither be included in a unit with other-employees, nor be established as a separate unit.”
  Maryland Drydock, supra, was subsequently overruled in Packard Motor Car Co., 61 N. L. R. B. 4, 64 N. L. R. B. 1212 (1945), where the Board held that foremen could constitute an appropriate unit for collective bargaining. The Board’s position was upheld 5^1 by this Court in Packard Co. v. NLRB, 330 U. S. 485 (1947). In view of the subsequent legislative reversal of the Packard decision, the dissenting opinion of Mr. Justice Douglas is especially pertinent. Id., at 493. He stated:
  “The present decision . . . tends to obliterate the line between .management and labor. It lends the sanctions of federal law to unionization at all levels of the industrial hierarchy. It tends to emphasize that the basic opposing forces in industry are not management and labor but the operating'group , on
  the one hand and the stockholder and bondholder group on the other. The industrial problem as so defined comes down to a contest over a fair division of the gross receipts of industry between these two groups. The struggle for control or . power between ■management and labor becomes secondary to a growing unity in their common demands on ownership.
  “I do not believe this is an exaggerated statement of the basic policy questions which underlie the present decision. For if foremen are ‘employees’ within-the meaning of the National Labor Relations Act, so are vice-presidents, managers, assistant managers, superintendents, assistant superintendents — -indeed, all who are on the payroll of the company, including the president; all who are commonly• referred to as the management, with the exception of the directors. If a union of vice-presidents applied for recognition as a collective bargaining agency, I do not see how we could deny it and yet allow the present application. But once vice-presidents, managers, superintendents, foremen all are unionized, management and labor will become more of a solid phalanx than separate factions in warring camps.
  “[I]f Congress, when it enacted the National Labor Relations Act, had in mind such a basic change in industrial philosophy, it would have left some clear and unmistakable trace of that purpose. But I find none.” Id., at 494-495.
  Mr. Justice Douglas also noted that the Wagner Act was intended to protect “laborers” and “workers” whose right to organize and bargain collectively had not been recognized by industry, resulting in strikes, strife, and unrest. By contrast, there was no similar history with respect to foremen, managers, superintendents, or vice presidents. Id., at 496-497. Furthermdre, other legislation indicated that where Congress desired to include managerial or supervisory personnel in the category of employees, it did so expressly. See, e. g., Railway Labor Act of 1926, 44 Stat. 577, 45 U. S. C. § 151; Merchant Marine Act, 1936, as amended, 52 Stat. 953, 46 U. S. C. § 1101 et seq.; Social Security Act, § 1101, 49 Stat. 647.
  B
  The Packard decision was a major factor in bringing about the Taft-Hartley Act of 1947, 61 Stat. 136. The House bill, H. R. 3020, 80th Cong., 1st Sess. ’ (1947), providéd for the exclusion of “supervisors,” a. category broadly defined to include any individual who had authority to hire, transfer, promote, discharge, reward, or discipline other employees or effectively to recommend such action. It also excluded (i) those who had authority to determine or effectively recommend the amount of wages earned by other employees; (ii) those employed in labor relations, personnel, and employment departments, as well as police and time-study personnel; and (iii) confidential employees. The Senate version of the bill, S. 1126, 80th Cong., 1st Sess. (1947), also excluded supervisors, but defined that category more narrowly than the House version, distinguishing between “straw bosses, leadmen, set-up men, and other minor supervisory employees, on the one hand, and the supervisor vested with such genuine management prerogatives as the right to hire or fire, discipline, or make effective recommendations with respect to such action.” S. Rep. No. 105, 80th Cong., 1st Sess., 4 (1947). It was the Senate’s view that employees such as “straw bosses,” who had only minor supervisory duties, should be included within the Act’s protections.
  Significantly, both the House Report and the Senate Report voiced concern over the Board’s broad reading of the term “employee” to include those clearly within the managerial hierarchy. Focusing on Mr. Justice Douglas’- dissent in Packard, the Senate Report specifically mentioned that even, vice presidents might be unionized under the Board’s decision. Ibid. It also noted that unionization of supervisors had hurt productivity, increased the accident rate, upset the balance of power in collective bargaining, and tended to blur the line between management and labor. Id., at 4^5. The House Report echoed the concern for reduction of industrial output and noted that unionization of supervisors had deprived employers of the loyal representations to which they were entitled. And in criticizing the Board’s expansive reading of the Act’s definition of the term “employees,” the House Report noted that “[w]hferu. Congress passed the Labor Act, we were concerned,' as we said in its preamble, with the welfare of ‘workers’ and ‘wage earners,’ not of the boss.” H. R. Rep. No. 245, 80th Cong., 1st Sess., 13 (1947).
  The Conference Committee adopted the Senate version of' the bill. H. R. Conf. Rep. No. 510, 80th Cong., 1st Sess., 35 (1947). The House Managers’ statement in explanation of the Conference, Committee Report stated:
  “The conference agreement, in the definition of ‘supervisor,’ limits such term to those individuals treated as supervisors under the Senate amendment. In the case of persons working in labor relations, personnel and employment departments, it was not thought necessary to make specific provision, as was done in the House bill, since the Board has treated, and presumably will continue to treat, such persons as outside the scope of the aet. This is the prevailing Board practice with respect to such people as confidential secretaries as well, and it was not the intention of the conferees to alter this practice in any respect. The conference agreement does not treat time-study personnel or guards as supervisors, as did the House bill. Since, however, time-study employees may qualify as professional personnel, the special provisions of the Senate amendment . . . applicable with respect to professional employees will cover many of this category. In the case of guards, the conference agreement does not permit the certification of a labor organization as the bargaining representative of guards if it admits to membership, or is affiliated with any organization that admits to membership, employees other than guards.” Id., at 35-36.
  The legislative history of the Taft-Hartley Act of 1947 may be summarized as follows. The House wanted to include certain persons within the definition of “supervisors,” such as straw bosses, whom the Senate believed should be protected by the Act. As to these persons, the Senate’s view prevailed. There were other persons, however, who both the House and the Senate believed were plainly outside the Act. The House wanted to make the exclusion of certain of these persons explicit. In the conference agreement, representatives from both the House and the Senate agreed that a specific provision was unnecessary since the Board had long regarded such persons as outside the Act. Among those mentioned as impliedly excluded were persons working in “labor relations, personnel and empldyment departments,” and “confidential employees.” But assuredly this did not exhaust the universe of such excluded persons. The legislative history strongly suggests that there also were other employees, much higher in the managerial structure, who were likewise regarded as so clearly outside the" Act that no specific exclusionary provision was thought necessary. For example, in its discussion of confidential employees, the House Report noted that “[m]ost of the people who would qualify as ‘confidential’ employees are executives and are excluded from the act in any event.” H. R. Rep. No. 245, p. 23 (emphasis added). We think the inference is plain that “managerial employees” were ■paramount among this impliedly excluded group. The Court of Appeals in the instant case put the issue well:
  “Congress recognized there were other persons so much more clearly ‘managerial’ that it was inconceivable that the Board would treat them as employees. Surely Congress could not have supposed that, while ‘confidential secretaries’ could not be organized, their bosses could be. In other words, Congress failed to enact the portion of Mr. Justice Douglas’ Packard dissent relating to the organization of executives, not because it disagreed but because it deemed this unnecessary.” 475 F. 2d, at 491-492. (Footnote omitted.)
  c
  Following the passage of the Taft-Hartley Act, the Board itself adhered to the view that “managerial employees” were outside the Act. In Denver Dry Goods, 74 N. L. R. B. 1167, 1175 (1947), assistant buyers, who were required to set good sales records as examples to sales employees, to assist buyers in the selection of merchandise, and to assume the buyer’s duties when the latter was not present, were excluded by the Board on the ground that “the. interests of these employees are more closely identified with those of management.” The Board reiterated this reading of the Act in Palace Laundry Dry Cleaning, 75 N. L. R. B. 320, 323 n. 4 (1947):
  “The determination of ‘managerial,’ like the determination of ‘supervisory,’ is to some extent necessarily a matter of the degree of authority exercised. We have in the past, and before the passage of the recent amendments to the Act, recognized and defined as' ‘managerial’ employees, executives who formulate and effectuate management policies by expressing and making operative decisions of their employer, and have excluded such managerial employees from bargaining units. We believe that the Act, as amended, contemplates the continuance of this practice.” (Citations omitted.)
  Buyers and assistant buyers were again excluded in Denton’s, Inc., 83 N. L. R. B. 35-37 (1949), because their “interests . . . are more-closely identified, with management . . •. .” And in American Locomotive Co., 92 N. L. R. B. 115, 116-117 (1950), the Board held that buyers could neither be included, in a unit of office and clerical employees nor placed in a separate unit, stating-:
  “The Employer maintains that the buyers are representatives of management. As it appears that the buyers are authorized to make substantial purchases for the Employer, we find that they aie representatives of management, and as such may not be accorded bargaining rights under the Act.”
  Buyers, who were authorized to bind the employer without prior approval, were also excluded from a unit in Curtiss-Wright Corp., 103 N. L. R. B. 458, 464 (1953), Because “they are representatives of management and as such may not be accorded bargaining rights under the Act.”
  Finally, in Swift & Co., 115 N. L. R. B. 752, 753-754 (1956), the Board reaffirmed its long-held understanding of the scope of the Act. In refusing to approve a unit of procurement drivers who were found to be representative of management, the Board declared:.
  “It was the clear' intent of Congress to" exclude from the coverage of-the Act all individuals allied with management. Such individuals' cannot be deemed to be employees for the purposes of the Act. Accordingly, we reaffirm the Board’s position that .representatives of management may not be accorded bargaining rights under the Act (Footnotes omitted.)
  Until its decision in- North Arkansas in 1970, the Board consistently followed this reading of the Act. It never certified any unit of “managerial employees,” separate or otherwise, and repeatedly stated that it was Congress’ intent that such employees not be accorded bargaining rights under the Act. And it was this reading which was permitted to stand when Congress again amended the Act in 1959. 73 Stat. 519.
  The Board’s exclusion of “managerial employees” defined as those who “formulate and effectuate management policies by expressing and making operative the decisions of their employer,” has also been approved by courts without exception. See, e. g., Westinghouse Electric Corp. v. NLRB, 424 F. 2d 1151, 1158 (CA7), cert, denied, 400 Ü. S. 831 (1970); Illinois State Journal-Register, Inc. v. NLRB, 412 F. 2d 37, 41 (CA7 1969) ; Continental Insurance Co. v. NLRB, 409 F. 2d 727, 730 (CA2), cert, denied, 396 U. S. 902 (1969); Retail Clerks International Assn. v. NLRB, 125 U. S. App. D. C. 63, 65-66, 366 F. 2d 642, 644-645 (1966) (Burger, J.), cert, denied, 386 U. S. 1017 (1967); International Ladies’ Garment Workers’ Union v. NLRB, 339 F. 2d 116, 123 (CA2 1964) (Marshall, J.). And in NLRB v. North Arkansas Electric Cooperative, Inc., 446 F. 2d 602 (1971), the Eighth Circuit r ^viewed the history of the Act and specifically disapproved the Board’s departure from its earlier position.
  D
  In sum, the Board’s early decisions, the purpose and legislative history of the Taft-Hartley Act- of 1947, the Board’s subsequent and consistent construction of the Act for more than two decades, and the decisions of the courts of appeals all point unmistakably to the conclusion that “managerial employees” are not covered by the Act. We agree with the Court of Appeals below that the Board “is not now free” to read a new and more restrictive meaning into the Act. 475 F. 2d, at 494.
  In view of our conclusion, the case must be remanded to permit the Board to apply the proper legal standard in determining the status of these buyers. SEC v. Chenery Corp., 318 U. S. 80, 85 (1943); FTC v. Sperry & Hutchinson Co., 405 U. S. 233, 249 (1972). We express no opinion as to whether these buyers fall within the category of “managerial employees.”
  III
  The Court of Appeals also held that, although the Board was not precluded from determining that buyers or some types of buyers were not “managerial employees,” it could do so only by invoking its rulemaking procedures under § 6 of the Act, 29 U. S. C. § 156. We disagree.
  At the outset, the precise nature of the present issue must be noted. The question is not whether the Board should have resorted to rulemaking, or in fact improperly-promulgated a “rule,” when in the context of the prior representation proceeding it held that the Act covers all “managerial employees” except those meeting the new “conflict of interest in labor relations” touchstone. Our conclusion that the Board applied the wrong legal standard makes consideration of that issue unnecessary. Rather, the present question is whether on remand the Board must invoke its rulemaking procedures if it determines, in light of our opinion, that these buyers are not “managerial employees”' under the Act. The Court of Appeals thought that rulemaking was reqfiired-because any Board finding that the company’s buyers are not “managerial” would be contrary to its prior decisions and would presumably be in the nature of a general rule designed “to fit all cases at all times.”
  A similar issue was presented to this Court in its second decision in SEC v. Chenery Cory., 332 U. S. 194 (1947) (Chenery II). There, the respondent corporation argued that in an adjudicative proceeding the Commission could not apply a general standard that it had formulated for the first time-in that proceeding. Rather, the Commission was required tó resort instead to its rulemaking procedures if it desired to promulgate a new standard that would govern future conduct. In rejecting this contention, the Court first noted that the Commission had a statutory duty to decide the issue at hand in light of the proper standards and that this duty remained “regardless of whether those standards previously had been spelled out in a general rule or regulation.” Id., at 201. The Court continued:
  “The function of filling in the interstices of the [Securities] Act should be performed, as much as possible, through this quasi-legislative promulgation of rules, to be applied in the future. But any rigid requirement to that effect would make the administrative process inflexible and incapable of dealing with many of the specialized problems which arise. . . . Not every principle essential to the effective administration of a statute can or should be cast immediately into the mold.of a general rule. Some principles must await their own development, while others must be adjusted to meet particular, unforeseeable situations. In performing its important functions in these respects, therefore, an administrative agency must be equipped to act either by general rule or by individual order. To insist upon one form of action to the exclusion of the other is to exalt form over necessity.
  “In other words, problems may arise in a case which the administrative agency could not reasonably foresee, problems which must be solved despite the absence of a relevant general rule. Or the agency may not have had sufficient experience with a particular problem to warrant rigidifying its tentative judgment into a hard and fast rule. Or the problem may be so specialized and varying in nature as to be impossible of capture within the boundaries of a general rule. In those situations, the agency must retain power to deal with the problems on a case-to-case basis if the administrative process is to be effective. There is thus a very definite place for the case-by-case evolution of statutory standards.” Id., at 202-203. (Emphasis added.)
  The Court concluded that “the choice made between proceeding by general rule or by individual, ad hoc litigation is one that lies primarily in the informed discretion of the. administrative agency.” Id., at 203.
  And in NLRB v. Wyman-Gordon Co., 394 U. S. 759 (1969), the Court upheld a Board order enforcing an election list requirement first promulgated in an earlier adjudicative proceeding in Excelsior Underwear Inc., 156 N. L. R. B. 1236 (1966). The plurality opinion of Mr. Justice Fortas, joined by The Chief Justice, Mr. Justice Stewart, and Mr. Justice White, recognized that “[adjudicated cases may and do . . . serve as vehicles for the formulation of agency policies, which are applied and announced therein,” and that such cases “generally provide a guide to action that the agency may be expected to take in future cases.” NLRB v. Wyman-Gordon Co., supra, at 765-766. The concurring opinion of Mr. Justice Black, joined by Mr. Justice Brennan and Mr. Justice Marshall, also noted that the Board had both adjudicative and rulemaking powers and that the' choice between the two was “within its informed discretion.” Id., at 772.
  The views expressed in Chenery II and Wyman-Gordon make plain that the Board is not precluded from announcing new principles in an adjudicative proceeding and that the choice between rulemaking and adjudication lies in the first instance within the Board’s discretion. Although there may be situations where the Board’s reliance on adjudication would amount to an abuse of discretion or a violation of the Act, nothing in the present case would justify such a conclusion. ' Indeed, there is ample indication that adjudication is especially appropriate in the instant context. As the Court of Appeals noted, “[t]here must be tens of thousands of manufacturing, wholesale and retail units which employ buyers, and hundreds of thousands of the latter.” 475 F. 2d, at 496. Moreover, duties of buyers vary widely depending on the company or industry. It is doubtful whether any generalized standard could be framed which would have more than marginal utility. The Board thus has reason to proceed with caution, developing its standards in a case-by-case manner with attention to the specific character of the buyers’ authority and duties in eg'ch compapy.- The Board’s judgment that-adjudication best serves this purpose is entitled to great weight.
  The possible reliance of industry on the Board’s past decisions with respect to buyers does not require a different result. It has not been shown that the adverse consequences ensuing from such reliance are so substantial that the Board should be precluded from reconsidering the issue in an adjudicative proceeding. Furthermore, this is not a case in which some new liability is sought to be imposed on individuals for past actions which were taken' in good-faith reliance on Board pronouncements. Nor are fines or damages involved here. In any event, concern about such consequences is largely speculative, for the Board has not yet finally determined whether these buyers are “managerial.”
  It is true, of course, that rulemaking would provide the Board with a forum for soliciting the informed views of those affected in industry and labor before embarking on a new course. But surely the Board has discretion to decide that the adjudicative procedures in this case may also produce the relevant information necessary to mature and fair consideration of the issues. Those most immediately affected, the buyers and the company in the particular case, are accorded a full opportunity to be heard before the Board makes its determination.
  The judgment of the Court of Appeals is therefore affirmed in part and reversed in part, and the cause remanded to that court with directions to remand to the Board for further proceedings' in conformity with this opinion.
  It is so ordered.
  As amended, 61 Stat. 136, 73 Stat. 519, 29 U. S. C. § 151 et seq.
  The opinion revealed that Board Member Jenkins did not view the company’s buyers as exercising managerial functions and therefore considered them “employees” under the Act to the same extent as production and maintenance employees. 190 N. L. R. B., at 431 n. 2. A majority of the Board, however, apparently accepted the company’s contention that the buyers were managerial employees. Id., at 432 n. 3.
  As mentioned, the Board had relied on its North Arkansas decision in the present case. The Eighth Circuit’s earlier opinion concerning a related issue in the same case is reported at 412 F. 2d 324 (1969).
  Section 2 (3) of the Act defines the term “employee” as follows:
  ' “The term ‘employee’ shall include any employee, and shall not be limited to the employees of a particular employer, unless this subchapter explicitly .states otherwise, and shall include any individual whose work has ceased as a consequence.of, or in connection with, any current labor dispute or because of any unfair labor practice, and who' has not obtained any other regular and substantially equivalent employment, but shall not include any individual employed as an agricultural laborer, or in the domestic service of any family or person at his home,, or any individual employed by his parent, or spouse, or any individual having the status of an independent contractor, or any individual employed as a supervisor, or any individual employed by an employer- subject to the Railway Labor Act, as amended from time to time, or by any other person who is not an employer as herein defined.” 29 U. S. C. § 152 (3).
  Supervisory employees are expresssly excluded from .the protections of the Act.' That term is defined in §2 (11):'
  “The term ‘supervisor’ means any individual having authority, in the interest of. the employer, to hire, transfer, suspend, lay off, ’ recall, promote, discharge, assign, reward, or discipline other employees; or responsibility to direct them,' or to adjust their grievances, or effectively to recommend such action, if in connection with the foregoing the exercise of such authority is riot of a merely routine or clerical nature but requires the use of iridependent judgment.” 29 U. S. C. §152(11).
  Red Lion Broadcasting Co. v. FCC, 395 U. S. 367, 381 (1969); Zemel v. Rusk, 381 U. S. 1, 11-12 (1965); Udall v. Tollman, 380 U. S. 1, 16-18 (1965); Norwegian Nitrogen Co. v. United States, 288 U. S. 294, 315 (1933).
  Zemel v. Rusk, supra, at 11-12; Commissioner v. Noel Estate, 380 U. S. 678, 682 (1965); NLRB v. Gullett Gin Co., 340 U. S. 361, 365-366 (1951); Helvering v. R. J. Reynolds Tobacco Co., 306 U. S. 110, 114—115 (1939); Norwegian Nitrogen Co. v. United States, supra, at 313.
  Zemel v. Rusk, supra, at 11—12; Costanzo v. Tillinghast, 287 U. S. 341, 345 (1932); United States v. Midwest Oil Co., 236 U. S. 459, 472-473 (1915).
  Red Lion Broadcasting Co. v. FCC, supra, at 380-381; FHA v. Darlington, Inc., 358 U. S. 84, 90 (1958).
  Section 2 (12) of the House bill defined the term “supervisor” as follows:
  “The term ‘supervisor’ means any individual—
  “(A) who has authority, in the interest of the employer—
  “(i) to hire, transfer, suspend, lay off, recall, promote, demote, discharge, assign, reward, or discipline any individuals employed by the employer, or to adjust their grievances, or to effectively recommend any such action; or
  “ (ii) to determine, or make effective recommendations with respect to, the amount of wages earned by any individuals employed by the employer, or to apply, or to make effective recommendations with respect to the application of, the factors upon the basis of which the wages of any individuals employed by the employer’ are determined, if in connection with the foregoing the exercise of such authority is not of a merely routine or clerical nature, but requires the exercise of independent-judgment;
  “(B) who is employed in labor relations, personnel, employment, police, or time-study matters or in connection with claims matters of employees against employers, or who is employed to act in other respects for the employer in dealing with other individuals employed by the employer, or who is employed to secure and furnish to the employer information to be used by the employer in connection with any of the foregoing; or
  “(C) who by the nature of his duties is given by the employer information that is of a confidential nature, and that is not available to .the public, to competitors, or to employees generally, for use in the interest of the employer.”
  Section 2 (11) of the Senate bill contained the following definition of the term “supervisor”:
  “The term ‘supervisor’ means any individual having ■ authority, in the interest of the employer to hire, transfer, suspend, lay off, recall, promete, discharge, assign, reward, or discipline other employees, or to adjust their grievances, or effectively to recommend such action if in connection with the foregoing the exercise of such authority is not of a merely routine or clerical nature, but requires the use of independent judgment.”
  The Report also makes evident that Congress was concerned with more than just the possibility of a, conflict of interest in labor relations if supervisors were unionized:
  “Supervisors are management people. They have distinguished themselves in their work. They have demonstrated their ability to take care of themselves without depending upon the presswe of collective action. No one forced them to become supervisors. They abandoned the 'collective security’ of the rank and file voluntarily, because they believed the opportunities thus opened to them to be more valuable to them than such 'security.’ It seems wrong, and it is wrong, to subject people of this kind, who have demonstrated' their initiative, their ambition and their ability to get ahead, to the leveling processes of seniority, uniformity and standardization that the- Supreme Court recognizes as being fundamental principles of unionism. (J. I. Case Co. v. National Labor Relations Board, 321 U. S. 332 (1944).) It is wrong for the foremen, for it discourages the things in them that made them foremen in the first place. For the same reason, that it discourages those best qualified to get ahead, it is wrong for industry, and particularly for the future strength and productivity of our country.” H. R. Rep. No. 246, 80th Cong., 1st Sess., 16-17 (1947).
  The Report stated in reference to “confidential employees”:
  “These are people who receive from their employers information- . that not only is confidential but also that is not available to the public, or to competitors, or to employees generally. Most of the people who would qualify as ‘confidential’ employees are executives and are excluded from the act in any event.
  “The Board, itself, normally excludes from bargaining units confidential clerks and secretaries to such people as these.” Ibid. (Emphasis added.)
  In 1946 in Ford Motor Co., 66 N. L. R. B. 1317, 1322, the Board had narrowed its definition of “confidential employees” to embrace only those who exercised “ ‘managerial’ functions in the field of labor relations.” The discussion of “confidential employees” in both the House and Conference Committee Reports, however, unmistakably refers to that term as de” d in the House bill, which was not limited just to those in “labor relations.” Thus, although Congress may. have misconstrued recent Board practice, it clearly thought that the Act did not cover “confidential employees” even under a. broad definition of that term.
  The dissenting opinion first asserts that the Act is “very plain on its face” and covers all employees except those expressly excluded post, at" 297, but later concedes that the “Conference Committee implied that certain groups of employees were to be .excluded.” Post, at 305. The dissent then argues that “managerial employees” were, not among those impliedly excluded because “no such explicit direction was set forth.” Ibid. This overlooks the fact that, as in the case of “confidential employees” and those working in “labor relations, personnel and employment departments,” no explicit ex-elusionary provision was necessary in 1947 because the Board had never approved the organization of “managerial employees” in either a separate unit or as part of a rank-and-file unit. Indeed, every prior Board decision had resulted in the exclusion of such employees as “managerial.”
  Moreover, it cannot be denied that Congress thought that “executives” were excluded from the Act, for the House Report so stated in express terms. See n. 12, supra. . And the congressional debates, along with the Senate Report, evinced a concern over the possible extension of the Act to cover corporate vice presidents and other executives who were part .of management. See, e. g., 93 Cong. Rec. 3443, 4136, 5014.
  In addition, the dissent completely ignores the fundamental change in industrial philosophy which would be accomplished through unionization of “managerial employees.” As Mr. Justice Douglas explained in his Packard dissent, the Wagner Act was designed to protect “laborers” and “workers,” not vice presidents and others clearly within the managerial hierarchy. Extension of the Act to cover true “managerial employees” would indeed be revolutionary, for it would eviscerate the traditional distinction bétween labor and management. If Congress intended a result so drastic, it is not unreasonable' to expect that it would have said so expressly.
  The dissent also relies upon the specific inclusion of “professional employees” within- the Act to support its assertion that “managerial employees” "were to be similarly treated. Post, at 297-298. See 29 U. S. C. § 152 (12). “Professional employees,” however,'are plainly not the same as “managerial employees.” As the Conference Committee Report explained, the term “professional employees” refers to “such persons as legal, engineering, scientific and medical personnel together with their junior professional assistants.” H. R. Conf. Rep. No. 510, 80th Cong., 1st Sess., 36. In contrast to “managerial employees,” they are not defined in terms of their authority “to formulate, determine and effectuate management policies.” Ford Motor Co., 66 N. L. R. B., at 1322.
  See, e. g., Eastern Camera & Photo Corp., 140 N. L. R. B. 569, 571 (1963); AFL-CIO, 120 N. L. R. B. 969, 973 (1958); General Tel. Co. of Ohio, 112 N. L. R. B. 1225, 1229 (1955).
  The cases excluding buyers or these exercising buyers’ functions from'other units are legion. See, e. g., Ed’s Foodland of Springfield, Inc., 159 N. L. R. B. 1256, 1260 (1966); Albuquerque Div., ACF Ind., Inc., 145 N. L. R. B. 403, 414-415 (1963); Weaver Motors, 123 N. L. R. B. 209, 215-216 (1959); Kearney & Trecker Corp., 121 N. L. R. B. 817, 822 (1958); Temco Aircraft Corp., 121 N. L. R. B. 1085, 1089 (1958); Federal Tel. & Radio Co., 120 N. L. R. B. 1652, 1653-1654 (1958).
  Surprisingly, the dissent maintains that the Board “actually held only twice” that “managerial employees” were not covered by the Act. Post, at 309. This is difficult to reconcile with the undisputed fact that until its decision in North Arkansas the Board had never even certified a separate unit of “managerial employees” and had stated in ease after case that managerial employees were not to be accorded bargaining rights under the Act. E. g., Palace Laundry Dry Cleaning, 75 N. L. R. B. 320 (1947); American Locomotive Co., 92 N. L. R. B. 15 (1950); Curtiss-Wright Corp., 103 N. L. R. B. 458 (1953); Swift & Co., 115 N. L. R. B. 752 (1956), and cases cited above.
  Palace Laundry Dry Cleaning, supra, at 323 n. 4. See Ford Motor Co., 66 N. L. R. B., at 1322.
  In Retail Clerks International Assn. v. NLRB, supra, Mr. Chief Justice (then Circuit Judge) Burger explained the Board’s policy on “managerial employees”:
  “The: Board also excludes from the protections of the Act, as managerial employees, ‘those who formulate,-'determine, and effectuate an employer’s policies,’ AFL-CIO, [120 N. L. R. B. 969, 973 (1958)], and those who have discretion in the performance of their jobs,- but not if the discretion must conform to an employer’s established policy,. Eastern Camera and Photo Corp., 140 N. L. R. B. 569, 571 (1963) (store managers who could set prices are not managerial).. The rationale for this Board policy, though unarticulated,• seenis to be the reasonable belief that Congress intended to ex-elude from the protection.of the Act those who comprised a part of ‘management’ or were allied with it on the theory that they were the one[s] from whom the workers needed protection.” 366 F. 2d, at 645. (Emphasis added.)
  In International Ladies’ Garment Workers’ Union v. NLRB, supra, Mr. Justice (then Circuit Judge) Marshall explained that “[ajlthough the Act makes no special provision for ‘managerial employees,’ under a Board policy of long duration, this category of personnel has been excluded from the protection of the Act.” 339 F. 2d, at 123.
  The contrary interpretation of the Act urgedi by the dissent would have far-reaching results. Although a shop foreman would be excluded from the Act, a wide range of executives, would be included. A major company, for example, may have scores of executive officers who formulate and effectuate management policies, yet have no supervisory responsibility or identifiable conflict of interest in labor relations. If Congress intended the unionization of such executives, it most certainly would have made-its design plain. See n. 13, supra.
  The Board has had ample experience in defining the term “managerial” in the manner which we think the Act contemplates. See, e. g., Eastern Camera & Photo Corp., supra, at 571. Of course, the specific job title of the employees involved is not in itself controlling. Rather, the question whether particular employees are “managerial” must be answered in terms of the employees’ actual job responsibilities, authority, and relationship to- management.
  To be sure, it would also be appropriate for the Board to exclude employees from a unit on the ground that their participation in a labor organization would'create a conflict of interest with their job responsibilities. New England Telephone, 90 N. L. R. B. 639 (1950). See also Retail Clerks International Assn. v. NLRB, 125 U. S. App. D. C., at 65-66, 366 F. 2d, at 644-645. In this respect, respondent has suggested that it was never afforded fair notice and an opportunity to introduce evidence relating specifically to the possibility of a conflict of interest in labor relations. Tr. of Oral Arg. 33-35, 43, 47. At the representation hearing, the hearing officer did not indicate that the conflict-of-interest standard was relevant, and respondent proceeded on,the assumption that the only-question was whether the buyers were “managerial employees.” App. 8, 83.
  The present record may well be adequate' for purposes of this determination. However, if new and relevant information, on this point is tendered on remand, the Board should consider reopening the record for purposes of its admission.
  Section 6 provides:
  “The Board shall have authority from time to time to make, amend, and rescind, in the .manner prescribed by the Administrative Procedure Act, such rules and regulations as may be necessary to carry out the provisions of this subchapter.” 29 U. S. C. § 156.
  The Administrative Procedure Act (APA) defines “rule” as “the whole or a part of an agency statement of general or particular applicability and future effect designed to implement, interpret, or prescribe law or policy.. ...” 5 U. S. C. § 551 (4). The rulemaking requirements include publication in the Federal Register of notice of the proposed rulemaking and hearing; an opportunity for interested persons to participate; a statement of the basis and purpose of the proposed rule; and publication in the Federal Register of the rule as adopted.
  The APA defines “adjudication” as “agency process for the formulation of an order,” and “order” is defined as “the whole or a part of a final disposition whether affirmative, negative, injunctive, or declaratory in form, of an agency in a matter other than rule making but including licensing.” 5 U. S. C. §§551 (7), (6). Proceedings for "the certification of worker representatives” are exempted from the Act’s procedural requirements for an “adjudication.” 5 U. S. C. §§ 554 (a)(6), 556 (a), 557 (a).
  Sections 9(c)(1) and (2) of the National Labor Relations Act (NLRA) empower the Board to investigate petitions involving questions of unit representation, to conduct hearings on such petitions, to direct representation elections, and to certify the results thereof. 29 U. S. C. §§159 (c)(1) and (2). Board determinations on such representation questions would appear to constitute “orders” within the meaning of the APA. See 5 U. S. C. §§ 551 (6), (7).
  The NLRA does not specify in what instances the Board must resort to rulemaking.
  A number of Board decisions have excluded buyers from, units of rank-and-file employees. See n. 14, supra. But American Locomotive Co. and Swift & Co. appear to be the only cases in which the Board has held that buyers are-not entitled to organize in a separate unit.
  Chenery II did pot involve §4 of the APA, 5 U. S. C. § 553, but is nevertheless analogous.
  “The Board had held that supervisory employees may organize in an independent union, Union Collieries Coal Co., 41 N. L. R. B. 961, 44 N. L. R. B. 165; and in an affiliated union, Godchaux Sugars, Inc., 44 N. L. R. B. 874. Then it held that there was' no unit appropriate to the organization of- supervisory employees. Maryland Drydock Co.,. 49 N. L. R. B. 733; Boeing Aircraft Co., 51 N. L. R. B. 67; Murray Corp. of America, 51 N. L. R. B. 94; General Motors Corp., 51 N. L. R. B. 457. In this case, 61 N. L. R. B. 4, 64 N. L. R. B. 1212; in L. A. Young Spring & Wire Corp., 65 N. L. R. B. 298; Jones & Laughlin Steel Corp., 66 N. L. R. B. 386, 71 N. L. R. B. 1261; and in California Packing Corp., 66 N. L. R. B. 1461, the Board re-embraced its earlier conclusions with the same progressive boldness it had shown in the Union Collieries and Godchaux Sugars cases. In none of this series of cases did the Board- hold that supervisors were not employees. See Soss Manufacturing Co., 56 N. L. R. B. 348.”
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