Justice Blackmun
delivered the opinion of the Court.
Under the Civil Service Reform Act of 1978, Pub. L. 95-454, 92 Stat. 1111, a federal employee may challenge agency disciplinary action by appealing the agency’s decision to the Merit Systems Protection Board (Board). If, however, the employee is a member of a collective-bargaining unit of federal employees, he, in the alternative, may challenge the disciplinary action by pursuing any grievance and arbitration procedure provided by the collective-bargaining agreement. Neither the Board nor the arbitrator may sustain the agency’s decision if the employee “shows harmful error in the application of the agency’s procedures in arriving at such decision.” 5 U. S. C. § 7701(c)(2)(A). The Board has interpreted this statute to require the employee to show error that causes substantial prejudice to his individual rights by possibly affecting the agency’s decision. This case presents the issue whether a different “harmful-error” interpretation should apply in an arbitration, or, to phrase it another way, whether the arbitrator may overturn agency disciplinary action on the basis of a significant violation of the collective-bargaining agreement that is harmful only to the union.
I
The 1978 Act is “a comprehensive revision of the laws governing the rights and obligations of civil servants, [and] contains the first statutory scheme governing labor relations between federal agencies and their employees.” Bureau of Alcohol, Tobacco and Firearms v. FLRA, 464 U. S. 89, 91 (1983). Among the major purposes of the Act were the “preservation of] the ability of federal managers to maintain ‘an effective and efficient Government,’” ibid., quoting 5 U. S. C. § 7101(b), and the “strengthening of] the position of [651]*651federal unions and [making] the collective-bargaining process a more effective instrument of the public interest,” 464 U. S., at 107.
To promote the first of these purposes, the Act provides that a federal employee may be removed or otherwise disciplined for unacceptable performance or for misconduct. Specifically, §4303 establishes procedures by which an agency may remove or demote an employee whose performance is unacceptable. In addition, §7512 provides that an agency may take adverse action against an employee, including removal, suspension for more than 14 days, reduction in grade or pay, or a furlough of 30 days or less, for, as § 7513 states, “such cause as will promote the efficiency of the service,” including misconduct. A federal employee subjected to agency disciplinary action taken pursuant to § 4303 or § 7512 may appeal the agency’s decision to the Board. §§ 4303(e), 7513(d), and 7701. The Board must sustain the agency’s decision if it is supported by appropriate evidence. § 7701(c)(1).1 The agency’s decision may not be sustained, however, if the employee “shows harmful error in the application of the agency’s procedures in arriving at such decision.” § 7701(c)(2)(A).2
To promote the second of these purposes of the Act — “to strengthen the position of federal unions and to make the [652]*652collective-bargaining process a more effective instrument of the public interest” — the Act requires federal agencies and unions representing agency employees to “negotiate over terms and conditions of employment, unless a bagaining proposal is inconsistent with existing federal law, rule, or regulation.” Bureau of Alcohol, Tobacco and Firearms v. FLRA, 464 U. S., at 92. Even matters reserved to agency-management discretion, such as discipline, are subject to negotiation concerning the procedures that management officials will observe in exercising their authority. § 7106(b)(2).
The Act also requires any collective-bargaining agreement between a federal agency and a union to provide for a grievance procedure and binding arbitration for the resolution of disputes arising under the agreement. §§ 7121(a) and (b). An employee in a bargaining unit having a negotiated grievance procedure that covers agency disciplinary action taken pursuant to §4303 or §7512 thus may elect to challenge such action by filing a grievance rather than appealing to the Board. § 7121(e)(1). If the employee elects so to proceed, and the union or the agency invokes binding arbitration, see § 7121(b)(3)(C), the arbitrator is to apply the same substantive standards that the Board would apply if the matter had been appealed. See S. Rep. No. 95-969, p. Ill (1978); H. R. Conf. Rep. No. 95-1717, p. 157 (1978). In particular, the Act provides: “In matters covered under sections 4303 and 7512 . . . which have been raised under the negotiated grievance procedure ... , an arbitrator shall be governed by section 7701(c)(1) . . . .” § 7121(e)(2). Section 7701(c)(1) incorporates by reference the provisions of subsection (c)(2), including the harmful-error rule. Thus, the statutory scheme mandates that the harmful-error rule is to apply whether the employee challenges the agency action through the Board or through binding arbitration.3
[653]*653f — 1 H-1
Thomas Rogers and Robert Wilson,-Jr. (grievants), were employed by General Services Administration (GSA) as Federal Protective Service (FPS) officers at the Federal Center in Denver, Colo. Rogers patrolled property owned or leased by the Federal Government at various locations in the Denver metropolitan area while maintaining contact either by radio or by telephone with the Command Center. Wilson worked as a dispatcher at the Center. Everything spoken over the radio and telephone lines of the Command Center is recorded on tape. This tape constitutes the record of activity at the Center.
On January 7, 1982, Rogers was on patrol in an official Government car. At the request of his shift supervisor, he drove to his home in a nearby suburb, picked up several cans of beer, and delivered the beer to the supervisor at the Center. The supervisor later drank the beer and left the empty cans at the Center when he went off duty. The following day, the supervisor, while off duty, became concerned that the unexplained presence of empty beer cans might lead to the discovery of his drinking beer while on duty. He therefore telephoned Wilson, at the Command Center, and instructed him to alter the tape for the previous day to include a false explanation for the presence of the beer cans. Wilson complied with this request.
Subsequently, an FPS official monitoring the tapes for an unrelated reason noted irregularities in them and concluded that they had been edited. GSA’s Inspector General initiated an investigation. Two special agents went to Rogers’ home and asked him to accompany them to the local police station for a “noncustodial” interrogation. The agents made [654]*654detailed notes of the interview. Wilson was interviewed in the same manner. Neither was advised that he was entitled to have a union representative present at the interview, and neither requested the presence of a representative.
About a month later, the agents again interviewed the two men separately and asked them to sign affidavits prepared from the agents’ notes of the earlier interviews.
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Justice Blackmun
delivered the opinion of the Court.
Under the Civil Service Reform Act of 1978, Pub. L. 95-454, 92 Stat. 1111, a federal employee may challenge agency disciplinary action by appealing the agency’s decision to the Merit Systems Protection Board (Board). If, however, the employee is a member of a collective-bargaining unit of federal employees, he, in the alternative, may challenge the disciplinary action by pursuing any grievance and arbitration procedure provided by the collective-bargaining agreement. Neither the Board nor the arbitrator may sustain the agency’s decision if the employee “shows harmful error in the application of the agency’s procedures in arriving at such decision.” 5 U. S. C. § 7701(c)(2)(A). The Board has interpreted this statute to require the employee to show error that causes substantial prejudice to his individual rights by possibly affecting the agency’s decision. This case presents the issue whether a different “harmful-error” interpretation should apply in an arbitration, or, to phrase it another way, whether the arbitrator may overturn agency disciplinary action on the basis of a significant violation of the collective-bargaining agreement that is harmful only to the union.
I
The 1978 Act is “a comprehensive revision of the laws governing the rights and obligations of civil servants, [and] contains the first statutory scheme governing labor relations between federal agencies and their employees.” Bureau of Alcohol, Tobacco and Firearms v. FLRA, 464 U. S. 89, 91 (1983). Among the major purposes of the Act were the “preservation of] the ability of federal managers to maintain ‘an effective and efficient Government,’” ibid., quoting 5 U. S. C. § 7101(b), and the “strengthening of] the position of [651]*651federal unions and [making] the collective-bargaining process a more effective instrument of the public interest,” 464 U. S., at 107.
To promote the first of these purposes, the Act provides that a federal employee may be removed or otherwise disciplined for unacceptable performance or for misconduct. Specifically, §4303 establishes procedures by which an agency may remove or demote an employee whose performance is unacceptable. In addition, §7512 provides that an agency may take adverse action against an employee, including removal, suspension for more than 14 days, reduction in grade or pay, or a furlough of 30 days or less, for, as § 7513 states, “such cause as will promote the efficiency of the service,” including misconduct. A federal employee subjected to agency disciplinary action taken pursuant to § 4303 or § 7512 may appeal the agency’s decision to the Board. §§ 4303(e), 7513(d), and 7701. The Board must sustain the agency’s decision if it is supported by appropriate evidence. § 7701(c)(1).1 The agency’s decision may not be sustained, however, if the employee “shows harmful error in the application of the agency’s procedures in arriving at such decision.” § 7701(c)(2)(A).2
To promote the second of these purposes of the Act — “to strengthen the position of federal unions and to make the [652]*652collective-bargaining process a more effective instrument of the public interest” — the Act requires federal agencies and unions representing agency employees to “negotiate over terms and conditions of employment, unless a bagaining proposal is inconsistent with existing federal law, rule, or regulation.” Bureau of Alcohol, Tobacco and Firearms v. FLRA, 464 U. S., at 92. Even matters reserved to agency-management discretion, such as discipline, are subject to negotiation concerning the procedures that management officials will observe in exercising their authority. § 7106(b)(2).
The Act also requires any collective-bargaining agreement between a federal agency and a union to provide for a grievance procedure and binding arbitration for the resolution of disputes arising under the agreement. §§ 7121(a) and (b). An employee in a bargaining unit having a negotiated grievance procedure that covers agency disciplinary action taken pursuant to §4303 or §7512 thus may elect to challenge such action by filing a grievance rather than appealing to the Board. § 7121(e)(1). If the employee elects so to proceed, and the union or the agency invokes binding arbitration, see § 7121(b)(3)(C), the arbitrator is to apply the same substantive standards that the Board would apply if the matter had been appealed. See S. Rep. No. 95-969, p. Ill (1978); H. R. Conf. Rep. No. 95-1717, p. 157 (1978). In particular, the Act provides: “In matters covered under sections 4303 and 7512 . . . which have been raised under the negotiated grievance procedure ... , an arbitrator shall be governed by section 7701(c)(1) . . . .” § 7121(e)(2). Section 7701(c)(1) incorporates by reference the provisions of subsection (c)(2), including the harmful-error rule. Thus, the statutory scheme mandates that the harmful-error rule is to apply whether the employee challenges the agency action through the Board or through binding arbitration.3
[653]*653f — 1 H-1
Thomas Rogers and Robert Wilson,-Jr. (grievants), were employed by General Services Administration (GSA) as Federal Protective Service (FPS) officers at the Federal Center in Denver, Colo. Rogers patrolled property owned or leased by the Federal Government at various locations in the Denver metropolitan area while maintaining contact either by radio or by telephone with the Command Center. Wilson worked as a dispatcher at the Center. Everything spoken over the radio and telephone lines of the Command Center is recorded on tape. This tape constitutes the record of activity at the Center.
On January 7, 1982, Rogers was on patrol in an official Government car. At the request of his shift supervisor, he drove to his home in a nearby suburb, picked up several cans of beer, and delivered the beer to the supervisor at the Center. The supervisor later drank the beer and left the empty cans at the Center when he went off duty. The following day, the supervisor, while off duty, became concerned that the unexplained presence of empty beer cans might lead to the discovery of his drinking beer while on duty. He therefore telephoned Wilson, at the Command Center, and instructed him to alter the tape for the previous day to include a false explanation for the presence of the beer cans. Wilson complied with this request.
Subsequently, an FPS official monitoring the tapes for an unrelated reason noted irregularities in them and concluded that they had been edited. GSA’s Inspector General initiated an investigation. Two special agents went to Rogers’ home and asked him to accompany them to the local police station for a “noncustodial” interrogation. The agents made [654]*654detailed notes of the interview. Wilson was interviewed in the same manner. Neither was advised that he was entitled to have a union representative present at the interview, and neither requested the presence of a representative.
About a month later, the agents again interviewed the two men separately and asked them to sign affidavits prepared from the agents’ notes of the earlier interviews. The griev-ants made corrections in the proposed affidavits and then, under oath, signed them. In the affidavits, the grievants admitted their participation in the above-described incidents of wrongdoing. As before, the grievants were not advised that they were entitled to have a union representative present, and they did not request representation.
On April 2, 1982, almost three months after the incidents, GSA formally advised, the grievants that it proposed to remove them from federal service. Upon receiving written responses to the charges, GSA informed Wilson that he would be removed on grounds of falsification of records and of attempting to conceal activities of record. Similarly, GSA informed Rogers that he would be removed on grounds of falsification of records, failure to report irregularities, and use of a Government vehicle for a nonofficial purpose.4
Both grievants elected to challenge their removal under the grievance and arbitration procedures established by the collective-bargaining agreement between GSA and their union, respondent American Federation of Government Employees. The union then invoked binding arbitration pursuant to § 7121(b)(3)(C). The arbitrator, respondent Nutt, found that the grievants had committed the alleged acts of wrongdoing and that this misconduct normally would justify the penalty of removal from Government service. The arbitrator also found, however, that GSA on its part had committed two procedural errors in violation of provisions [655]*655of the collective-bargaining agreement. First, GSA had failed to give the grievants an opportunity to have a union representative present during interrogation.5 Second, GSA had permitted an unreasonable period of time to elapse between the date it first learned of the misconduct and the date it issued the notices of proposed removal.6 The arbitrator concluded that there was no prejudice to the grievants themselves due either to the failure to have a union representative present or to the delay in the issuance of the notices. He found, nevertheless, that the removals were not for just cause “[sjolely because of the Agency’s pervasive failure to comply with the due process requirements of the [collective-bargaining] agreement.” App. to Pet. for Cert. 38a. He therefore reduced the penalties imposed on the grievants from removal to not less than two weeks’ disciplinary suspension without pay. Id., at 39a. In addition, he required that Wilson be placed in a position in which the agency would be protected from his “demonstrated proclivity to tamper with the tape recording system.” Id., at 38a.
[656]*656Pursuant to §§ 7703(d) and 7121(f), the Director of the Office of Personnel Management sought review of the arbitrator’s decision by the United States Court of Appeals for the Federal Circuit. See 28 U. S. C. § 1295(a)(9). The Director contended that the arbitrator had not properly applied the Act’s harmful-error rule. The Court of Appeals granted the petition for review, and it was heard by a 5-judge panel. The court affirmed the arbitrator’s decision in substantial part. 718 F. 2d 1048 (1983). It held that an arbitrator must apply the harmful-error standard of § 7701(c)(2)(A) in determining whether a grievant is personally prejudiced. The court noted that, in the present case, the arbitrator found that the grievants had not been personally prejudiced. Nevertheless, following whatxit deemed to be the lead of the decision in Devine v. White, 225 U. S. App. D. C. 179, 697 F. 2d 421 (1983),7 the Court of Appeals went on to hold that even though the particular grievants may not themselves have been adversely affected, the arbitrator, in making the ultimate award, could take into account significant violations of the collective-bargaining agreement that were important to the union. The court reasoned: “The union is a major (if not the major) party to the arbitration and its proper interests are to be protected, even though the interests of the particular grievants may not, alone, call for protection” (emphasis in original). 718 F. 2d, at 1054. Here, the union and the agency agreed to procedural safeguards concerning [657]*657representation and notice, and these procedures effectively became union rights. Thus, “[violations of explicit and important procedural rights contained in a contract, such as these, could fairly be said to be tantamount to ‘harmful error’ to the union within the scope of 5 U. S. C. § 7701(c)(2)(A) (1982) for the purposes of collective bargaining arbitration in which the union is a proper party.” Id., at 1055. The court concluded that the arbitrator’s reduction of the griev-ants’ penalties was a proper means of “penalizing the agency” for disregarding the procedural protections of the collective-bargaining agreement.8 Ibid.
Because of the importance of the issue, we granted certio-rari. 469 U. S. 814 (1984).
M HH l — l
A
The harmful-error rule of 5 U. S. C. § 7701(c)(2)(A) provides that an agency’s decision that is appealable to the Board may not be sustained if the employee “shows harmful error in the application of the agency’s procedures in arriving at such decision.” Petitioner argues that “harmful error” is error that causes substantial prejudice to the rights of the individual employee by possibly affecting the agency’s decision.
The Act does not define the term “harmful error,”9 and the legislative history of § 7701(c)(2)(A) is inconclusive.10 The [658]*658Act provides, however, that the Board “may prescribe regulations to carry out the purpose of [§ 7701],” the provision in which the harmful-error rule appears. See § 7701(j). Pursuant to this authority, the Board has promulgated a definition of “harmful error”:
“Error by the agency in the application of its procedures which, in the absence or cure of the error, might have caused the agency to reach a conclusion different than the one reached. The burden is upon the appellant to show that based upon the record as a whole the error was harmful, i. e., caused substantial harm or prejudice to his/her rights.” 5 CFR § 1201.56(c)(3) (1985).11
[659]*659The agency’s “procedures” considered by the Board in applying § 7701(c)(2)(A) include not only procedures required by statute, rule, or regulation,12 but also procedures required by a collective-bargaining agreement between the agency and a union.13 Thus, in an appeal of an agency disciplinary decision to the Board, the agency’s failure to follow bargained-for procedures may result in its action’s being overturned, but only if the failure might have affected the result of the agency’s decision to take the disciplinary action against the individual employee. At least insofar as it applies to proceedings before the Board, this interpretation of the harmful-error rule is entitled to substantial deference.14 See Chevron U. S. A. Inc. v. Natural Resources Defense Council, Inc., 467 U. S. 837, 844 (1984).
Respondents do not dispute the correctness of the Board’s definition of harmful error insofar as it applies to proceedings before the Board. Respondents argue, however, that an arbitral proceeding differs significantly from a Board proceeding, and that a different definition of harmful error should apply in the arbitral context. Respondents point out that an appeal to the Board is taken solely by the employee or [660]*660applicant for employment, see 5 U. S. C. § 7701(a), and that the union has no statutory role in a Board proceeding. In contrast, according to respondents, the union should be considered to be a major party in an arbitration. The union and the agency negotiate the grievance procedures and the terms of the collective-bargaining agreement establishing the extent of the arbitrator’s authority. The union and the agency possess the exclusive power to invoke the arbitral process, and these parties jointly select an acceptable arbitrator.15 Thus, according to respondents, while the Board must focus exclusively on the rights of the individual employee, the arbitrator should take a broader view and consider the rights of the union as well. Respondents contend that the Court of Appeals therefore correctly held that “the arbitrator can take account of significant violations of the collective bargaining agreement, important to the union, even though the particular grievants may not have been themselves adversely affected.” 718 F. 2d, at 1054.
We are not persuaded by respondents’ arguments. Congress clearly intended that an arbitrator would apply the same substantive rules as the Board does in reviewing an agency disciplinary decision. Section 7121(e)(2) provides that in matters involving agency discipline “which have been raised under the negotiated grievance procedure ... , an arbitrator shall be governed by section 7701(c)(1) of this title, as applicable.” Section 7701(c)(1) incorporates by reference the harmful-error rule of § 7701(c)(2)(A). The Senate Report explains that, under this provision, “if an employee exercises the option to pursue a matter [involving agency discipline] [661]*661through the negotiated grievance procedure an arbitrator must apply the same standards in deciding the case as would be applied by an administrative law judge or an appeals officer if the case had been appealed through the appellate procedures of 5 U. S. C. section 7701.” S. Rep. No. 95-969, p. 111 (1978). The version of the bill passed by the House did not contain a similar provision. The Conference Committee noted that, under the Senate provision, “when considering a grievance involving an adverse action otherwise appealable to the [Board] . . . the arbitrator must follow the same rules governing burden of proof and standard of proof that govern adverse actions before the Board.” H. R. Conf. Rep. No. 95-1717, p. 157 (1978). The Conference Committee “adopted the Senate provision in order to promote consistency in the resolution of these issues, and to avoid forum shopping.”16 Ibid.
Adoption of respondents’ interpretation of the harmful-error rule in the context of an arbitral proceeding would directly contravene this clear congressional intent. An employee who elects to appeal an agency disciplinary decision to the Board must prove that any procedural errors substantially prejudiced his rights by possibly affecting the agency’s decision. Under respondents’ interpretation, however, an employee who elects to use the grievance and arbitration procedures may obtain reversal merely by showing that significant violations of the collective-bargaining agreement, harmful to the union, occurred. In the present case, if the disciplined employees had elected to appeal to the Board, their discharges would have been sustained by the Board under its interpretation of the harmful-error rule. Because, [662]*662however, they pursued the negotiated grievance and arbitration procedures, they benefited from the different interpretation of the harmful-error rule advocated by respondents and applied by the arbitrator and the Court of Appeals, and their discharges were replaced with brief suspensions. If respondents’ interpretation of the harmful-error rule as applied in the arbitral context were to be sustained, an employee with a claim that the agency violated procedures guaranteed by the collective-bargaining agreement would tend to select the forum — the grievance and arbitration procedures — that treats his claim more favorably. The result would be the very inconsistency and forum shopping that Congress sought to avoid.
B
We, however, do not rest our decision solely on deference to the Board’s interpretation of the harmful-error rule and on the clear congressional intent that an arbitrator apply the same substantive standards as does the Board. Rather, we rest our decision ultimately on the conclusion that we must interpret the harmful-error rule as does the Board if we are “‘to remain faithful to the central congressional purposes underlying the enactment of the CSRA.’” Lindahl v. Office of Personnel Management, 470 U. S. 768, 794 (1985), quoting Devine v. White, 225 U. S. App. D. C., at 183, 697 F. 2d, at 425. As noted above, one of the major purposes of the Act was to “preserv[e] the ability of federal managers to maintain ‘an effective and efficient Government.’” Bureau of Alcohol, Tobacco and Firearms v. FLRA, 464 U. S., at 92, quoting 5 U. S. C. § 7101(b). In order to achieve this purpose, one of the “central tasks” of the Act was to “[a]llow civil servants to be able to be hired and fired more easily, but for the right reasons.” S. Rep. No. 95-969, p. 4 (1978). In particular, the provisions of § 7701 of the Act, including the harmful-error rule, were intended “to give agencies greater ability to remove or discipline expeditiously employees who engage in misconduct, or whose work performance is un[663]*663acceptable.” Id., at 51.17 In the present case, the grievants concededly committed improper acts that justified their removal from the federal service. Although the agency committed procedural errors, those errors do not cast doubt upon the reliability of the agency’s factfinding or decision. We do not believe that Congress intended to force the Government to retain these erring employees solely in order to “penalize the agency” for nonprejudicial procedural mistakes it committed while attempting to carry out the congressional purpose of maintaining an effective and efficient Government.
Respondents argue, however, that penalizing the Government in this manner is necessary in order to enforce the procedures arrived at through collective bargaining, and thus to promote a second major purpose of the Civil Service Reform Act — “to strengthen the position of federal unions and to make the collective-bargaining process a more effective instrument of the public interest.” Bureau of Alcohol, Tobacco and Firearms v. FLRA, 464 U. S., at 107. Respondents contend that if harmful error must be shown in the sense that an employee’s own case is prejudiced, then the procedures arrived at through collective bargaining really become meaningless. We find this concern overstated. Under any interpretation of the harmful-error rule, unions are free to bargain for procedures to govern agency action, see §§ 7106 (b)(2) and (3), and agencies are obligated to follow the agreed-upon procedures. If the agency violates those procedures with prejudice to the individual employee’s rights, any resulting agency disciplinary decision will be reversed by the Board or by an arbitrator.
Even if the violation is not prejudicial to the individual employee, the union is not without remedy. The Act per[664]*664mit.fi the union to file a grievance on its own behalf. § 7121 (b)(3)(A). The Act broadly defines “grievance” to include “any complaint... by any employee labor organization . . . concerning . . . the effect or interpretation, or a claim of breach, of a collective bargaining agreement.” § 7103(a)(9) (C)(i). This statutory authorization clearly permits the union to file a grievance alleging a violation of the procedural requirements established in the collective-bargaining agreement.18 The arbitrator can remedy such violation by ordering the agency to “cease and desist” from any further such violation. In addition, if the violation constitutes “a clear and patent breach of the terms of the agreement,” Iowa National Guard and National Guard Bureau, 8 F. L. R. A. 500, 510 (1982), the union may file an unfair labor practice charge with the Federal Labor Relations Authority.19 See [665]*665§§711620 and 7118. Our holding today therefore does not prevent the union from obtaining a binding interpretation of a disputed provision of the collective-bargaining agreement or from enforcing agency compliance with that provision. We hold only that the means of compelling compliance do not include forcing the agency to retain an employee who is reliably determined to be unfit for federal service.
The judgment of the Court of Appeals is reversed.
It is so ordered.
Justice Powell took no part in the decision of this case.