Cordy, J.
The Massachusetts Association of Minority Law Enforcement Officers (MAMLEO) appeals from a ruling of a judge in the Superior Court upholding a decision of the Civil Service Commission (commission) that the police department of Boston (police department) improperly promoted certain minority police officers to the ranks of sergeant and lieutenant over nonminority defendants with higher test scores. MAMLEO, a plaintiff intervener in the Superior Court proceeding and not a party to the original proceedings before the commission, argues that the judge erred as a matter of law in upholding the commission’s decision, and abused his discretion in denying MAM-LEO’s motion to supplement the administrative record.2 The police department did not appeal from the Superior Court judge’s decision. We granted MAMLEO’s application for direct appellate review, and now affirm the judgment of the Superior Court.
Background. On January 30 and October 2, 1996, the police department made promotions to the ranks of sergeant and lieutenant from certified lists ranking each candidate based on his or her score on a September 12, 1992, civil service promotional examination. The examination had been developed by the State Department of Personnel Administration, now the human resources division (division), in compliance with a 1991 amendment to a Federal consent decree entered in Massachusetts Ass’n of Afro-American Police, Inc. vs. Boston Police Dep’t, No. 78-529-McN (D. Mass. 1980). See note 5, infra. For most of the promotions, the police department selected the highest scoring candidates in rank order.3 However, the police department departed from strict rank order in promoting six minority [258]*258officers to sergeant and two minority officers to lieutenant, over various nonminority officers with higher civil service examination scores, a process known as “bypass.” Bielawski v. Personnel Adm’r of the Div. of Personnel Admin., 422 Mass. 459, 460 (1996). See G. L. c. 31, § 27. The examination scores of the minority officers who were promoted were no more than two points lower than those of the nonminority officers who were bypassed.
As required by Massachusetts civil service law, the police department provided reasons for these bypasses to the State personnel administrator. See id. The reasons given were: (1) ”to ensure compliance with current EEOC [United States Equal Employment Opportunity Commission] guidelines,”* *4 (2) “as a result of the [c]onsent [d]ecree between the [police department] and [MAMLEO],”5 and (3) that the “promotion of a limited number of black officers to sergeant and lieutenant was constitutionally permissible” under the strict scrutiny standard [259]*259applied to equal protection claims.* ***6 The personnel administrator approved the bypasses.7
The bypassed officers appealed to the commission pursuant to G. L. c. 31, § 2 (b),8 and the police department responded with a motion to dismiss. While the motion was pending before the commission, the United States Court of Appeals for the First Circuit issued its decision in Boston Police Superior Officers Fed’n v. Boston, 147 F.3d 13 (1st Cir. 1998) (Superior Officers), see note 10, infra, ruling that the consent decree relied on by the police department applied only to promotions to the rank of sergeant, not to promotions to lieutenant, and had expired in April, 1995. Id. at 17. The commission invited the parties to submit additional argument addressing the impact, if any, of that ruling on the cases pending before it. The police department and the bypassed officers each submitted supplemental legal memoranda arguing that the Superior Officers decision supported their respective positions. These memoranda were added to the record before the commission, which was not otherwise augmented by the parties.
Administrative action. The fundamental purpose of the civil service system is to guard against political considerations, favoritism, and bias in governmental hiring and promotion. Cambridge v. Civil Serv. Comm’n, 43 Mass. App. Ct. 300, 304 (1997), and cases cited. The commission is charged with ensuring that the system operates on “[b]asic merit principles,” as defined in G. L. c. 31, § 1,9 absent properly documented and supported bases for departing from such principles in particular [260]*260cases. In the context of carrying out these responsibilities, and after holding hearings on September 11, 1997, and September 2, 1998, the commission ruled that the bypasses proposed by the police department were improper.
In reaching its decision, the commission applied the standard of review required by the governing statute, G. L. c. 31, § 2 (b): “to find whether, on the basis of the evidence before it, the appointing authority has sustained its burden of proving [by a preponderance of the evidence] that there was reasonable justification for the action taken by [it]” (i.e., promoting on considerations other than merit). Cambridge v. Civil Serv. Comm’n, supra at 303, citing Mayor of Revere v. Civil Serv. Comm’n, 31 Mass. App. Ct. 315, 320 n.10, 321 n.11, 322 n.12 (1991). In this context, reasonable justification means “done upon adequate reasons sufficiently supported by credible evidence, when weighed by an unprejudiced mind, guided by common sense and by correct rules of law.” Selectmen of Wakefield v. Judge of First Dist. Court of E. Middlesex, 262 Mass. 477, 482 (1928).
Applying this standard to the police department’s enumerated reasons for departing from rank order promotions, the commission found them and the police department’s reliance on the Superior Officers case unpersuasive.10 In addressing two of the three reasons the police department had given for making the bypasses, the commission noted that the Superior Officers decision had made it clear that the consent decree had expired in April, 1995, prior to the 1996 promotions at issue here, see Superior Officers, supra at 17, and that the EEOC guidelines were not enforceable in this context in the absence of the consent decree. See note 4, supra. Therefore, neither the decree [261]*261nor the EEOC guidelines provided a reasonable justification for bypasses that came after the decree’s expiration.11
That left only the police department’s constitutional argument to support the bypass promotions, i.e., that those promotions would survive a constitutional challenge under the equal protection clause. The commission found this constitutional argument to be misplaced, because its inquiry in a bypass appeal is very different from that required for an equal protection claim. In deciding bypass appeals, the commission must determine whether the appointing authority has complied with the requirements of Massachusetts civil service law for selecting lower scoring candidates over higher scoring candidates, and not whether those promotions might pass constitutional muster if challenged in some other forum on equal protection grounds.
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Cordy, J.
The Massachusetts Association of Minority Law Enforcement Officers (MAMLEO) appeals from a ruling of a judge in the Superior Court upholding a decision of the Civil Service Commission (commission) that the police department of Boston (police department) improperly promoted certain minority police officers to the ranks of sergeant and lieutenant over nonminority defendants with higher test scores. MAMLEO, a plaintiff intervener in the Superior Court proceeding and not a party to the original proceedings before the commission, argues that the judge erred as a matter of law in upholding the commission’s decision, and abused his discretion in denying MAM-LEO’s motion to supplement the administrative record.2 The police department did not appeal from the Superior Court judge’s decision. We granted MAMLEO’s application for direct appellate review, and now affirm the judgment of the Superior Court.
Background. On January 30 and October 2, 1996, the police department made promotions to the ranks of sergeant and lieutenant from certified lists ranking each candidate based on his or her score on a September 12, 1992, civil service promotional examination. The examination had been developed by the State Department of Personnel Administration, now the human resources division (division), in compliance with a 1991 amendment to a Federal consent decree entered in Massachusetts Ass’n of Afro-American Police, Inc. vs. Boston Police Dep’t, No. 78-529-McN (D. Mass. 1980). See note 5, infra. For most of the promotions, the police department selected the highest scoring candidates in rank order.3 However, the police department departed from strict rank order in promoting six minority [258]*258officers to sergeant and two minority officers to lieutenant, over various nonminority officers with higher civil service examination scores, a process known as “bypass.” Bielawski v. Personnel Adm’r of the Div. of Personnel Admin., 422 Mass. 459, 460 (1996). See G. L. c. 31, § 27. The examination scores of the minority officers who were promoted were no more than two points lower than those of the nonminority officers who were bypassed.
As required by Massachusetts civil service law, the police department provided reasons for these bypasses to the State personnel administrator. See id. The reasons given were: (1) ”to ensure compliance with current EEOC [United States Equal Employment Opportunity Commission] guidelines,”* *4 (2) “as a result of the [c]onsent [d]ecree between the [police department] and [MAMLEO],”5 and (3) that the “promotion of a limited number of black officers to sergeant and lieutenant was constitutionally permissible” under the strict scrutiny standard [259]*259applied to equal protection claims.* ***6 The personnel administrator approved the bypasses.7
The bypassed officers appealed to the commission pursuant to G. L. c. 31, § 2 (b),8 and the police department responded with a motion to dismiss. While the motion was pending before the commission, the United States Court of Appeals for the First Circuit issued its decision in Boston Police Superior Officers Fed’n v. Boston, 147 F.3d 13 (1st Cir. 1998) (Superior Officers), see note 10, infra, ruling that the consent decree relied on by the police department applied only to promotions to the rank of sergeant, not to promotions to lieutenant, and had expired in April, 1995. Id. at 17. The commission invited the parties to submit additional argument addressing the impact, if any, of that ruling on the cases pending before it. The police department and the bypassed officers each submitted supplemental legal memoranda arguing that the Superior Officers decision supported their respective positions. These memoranda were added to the record before the commission, which was not otherwise augmented by the parties.
Administrative action. The fundamental purpose of the civil service system is to guard against political considerations, favoritism, and bias in governmental hiring and promotion. Cambridge v. Civil Serv. Comm’n, 43 Mass. App. Ct. 300, 304 (1997), and cases cited. The commission is charged with ensuring that the system operates on “[b]asic merit principles,” as defined in G. L. c. 31, § 1,9 absent properly documented and supported bases for departing from such principles in particular [260]*260cases. In the context of carrying out these responsibilities, and after holding hearings on September 11, 1997, and September 2, 1998, the commission ruled that the bypasses proposed by the police department were improper.
In reaching its decision, the commission applied the standard of review required by the governing statute, G. L. c. 31, § 2 (b): “to find whether, on the basis of the evidence before it, the appointing authority has sustained its burden of proving [by a preponderance of the evidence] that there was reasonable justification for the action taken by [it]” (i.e., promoting on considerations other than merit). Cambridge v. Civil Serv. Comm’n, supra at 303, citing Mayor of Revere v. Civil Serv. Comm’n, 31 Mass. App. Ct. 315, 320 n.10, 321 n.11, 322 n.12 (1991). In this context, reasonable justification means “done upon adequate reasons sufficiently supported by credible evidence, when weighed by an unprejudiced mind, guided by common sense and by correct rules of law.” Selectmen of Wakefield v. Judge of First Dist. Court of E. Middlesex, 262 Mass. 477, 482 (1928).
Applying this standard to the police department’s enumerated reasons for departing from rank order promotions, the commission found them and the police department’s reliance on the Superior Officers case unpersuasive.10 In addressing two of the three reasons the police department had given for making the bypasses, the commission noted that the Superior Officers decision had made it clear that the consent decree had expired in April, 1995, prior to the 1996 promotions at issue here, see Superior Officers, supra at 17, and that the EEOC guidelines were not enforceable in this context in the absence of the consent decree. See note 4, supra. Therefore, neither the decree [261]*261nor the EEOC guidelines provided a reasonable justification for bypasses that came after the decree’s expiration.11
That left only the police department’s constitutional argument to support the bypass promotions, i.e., that those promotions would survive a constitutional challenge under the equal protection clause. The commission found this constitutional argument to be misplaced, because its inquiry in a bypass appeal is very different from that required for an equal protection claim. In deciding bypass appeals, the commission must determine whether the appointing authority has complied with the requirements of Massachusetts civil service law for selecting lower scoring candidates over higher scoring candidates, and not whether those promotions might pass constitutional muster if challenged in some other forum on equal protection grounds. The commission concluded that the police department had failed to justify the challenged promotions as required by State law: “Upon expiration of the consent decree, the bypasses, based purely on race,” a factor listed in G. L. c. 31, § 1 (e), as incompatible with basic merit principles, “no longer comport” with such principles.12
As a remedy, the commission ordered the division to place the bypassed officers at the top of the list of candidates for promotion, reviving a candidate’s eligibility if necessary, so that [262]*262the police department would have to consider each officer when it next made promotions to the rank of sergeant or lieutenant.13
Superior Court ruling. The police department sought review of the commission’s decision in the Superior Court pursuant to G. L. c. 30A, § 14, and G. L. c. 31, § 44,14 arguing that it properly considered race in the 1996 promotions. The police department reasoned that race-based bypasses were not inconsistent with established merit principles in this particular case, because the bypasses were being used to remedy the police department’s past racial discrimination.
MAMLEO was allowed to intervene in the Superior Court action, and filed a motion seeking to supplement the administrative record with extensive evidentiary materials that were not before the commission. Those materials had been part of the underlying record used by the police department and MAMLEO to support their argument in Superior Officers, supra at 23-24,15 that the promotion in that case was a “sufficiently narrow remedy” to address past racial discrimination by the police department. The materials included expert witness affidavits purportedly demonstrating that the 1992 examination did not validly distinguish among officers scoring within three points of each other, that such officers must therefore be considered functionally equivalent for promotion purposes, and that their functionally equivalent test scores should be “banded” together for the purpose of making promotion decisions. MAMLEO’s motion to supplement the record was denied. The judge’s review of the commission’s decision was therefore based solely on the record that had been before the commission.
“In reviewing [the commission’s] action under G. L. c. 30A, § 14 (7), it was not open to the Superior Court judge to [263]*263substitute his judgment for that of the commission.” Thomas v. Civil Serv. Comm’n, 48 Mass. App. Ct. 446, 451 (2000). Instead, the judge was required by § 14 (7) to “give due weight to the experience, technical competence, and specialized knowledge of the agency, as well as to the discretionary authority conferred upon it.” Iodice v. Architectural Access Bd., 424 Mass. 370, 375-376 (1997); School Comm. of Brockton v. Civil Serv. Comm’n, 43 Mass. App. Ct. 486, 490 (1997). Here, the judge affirmed the decision of the commission:
“This Court is satisfied that the administrative record fails to support plaintiffs’ contention that the [cjommission committed an error of law. Nor is the argument that the [cjommission’s ruling is arbitrary, capricious, or an abuse of discretion supported by the record. Rather ... the record indicates that the [cjommission acted lawfully and within its discretion by finding the [police department’s] bypasses lacked a sound and sufficient reason and clashed with basic merit principles.”
The judge’s evaluation of the commission’s ruling is a sound one, “setting forth his reasoning . . . in a full and clear discussion,” Iodice v. Architectural Access Bd., supra at 371, and we employ it as the basis for our own brief analysis of the commission’s ruling.
Like the Superior Court, we review the commission’s decision under G. L. c. 31, § 44, “to determine if it violates any of the standards set forth in G. L. c. 30A, § 14 (7),[16] and cases construing those standards.” Plymouth v. Civil Serv. Comm’n, 426 Mass. 1, 5 (1997). The plaintiff bore the burden of demonstrating the invalidity of the commission’s ruling. Coggin v. Massachusetts Parole Bd., 42 Mass. App. Ct. 584, 587 (1997). Merisme v. Board of Appeals on Motor Vehicle Liab. Policies & Bonds, 27 Mass. App. Ct. 470, 474 (1989). This is a heavy [264]*264burden, for we also give due weight to the commission’s expertise, as required by § 14 (7). See Iodice v. Architectural Access Bd., supra at 375-376; Protective Life Ins. Co. v. Sullivan, 425 Mass. 615, 618 (1997) (“In general, we grant substantial deference to an interpretation of a statute [e.g., the civil service statutes] by the administrative agency charged with its administration”); Boston Police Superior Officers Fed’n v. Labor Relations Comm’n, 410 Mass. 890, 892 (1991) (considerable deference generally accorded agency decision, unless agency commits error of law).
The commission properly placed the burden on the police department to establish a reasonable justification for the bypasses, see Cambridge v. Civil Serv. Comm’n, 43 Mass. App. Ct. 300, 303 (1997), and properly weighed those justifications against the fundamental purpose of the civil service system, id. at 304, to ensure decision-making in accordance with basic merit principles. G. L. c. 31, § 1 (e). See note 9, supra. In rejecting the three reasons given by the police department for the challenged race-based bypasses — the consent decree (that had expired), the EEOC guidelines (that were no longer enforceable after the consent decree expired), and a constitutional rationale (that was inapposite) ■— the commission acted well within its discretion. In the circumstances of this case, the reasons proffered by the police department simply failed to justify the 1996 promotions at issue. The commission, and the Superior Court judge on review, correctly concluded that without the consent decree’s mandate, race, a consideration specifically identified by the Legislature in G. L. c. 31, § 1 (e),17 as inconsistent with basic merit principles, cannot be used to justify a bypass. While civil service law allows consideration of race in promotion decisions as part of an approved affirmative action plan (see note 12, supra), there was no such plan here and therefore the police department improperly based these promotions on race.
We have examined the entire administrative record, see Mayor [265]*265of Revere v. Civil Serv. Comm’n, 31 Mass. App. Ct. 315 322 (1991) (“we must inquire whether there is substantial evidence in the record before the commission to support the commission’s decision”), and taken into account whatever in the record would fairly detract from the supporting evidence’s weight. Cobble v. Commissioner of the Dep’t of Social Servs., 430 Mass. 385, 390 (1999). We conclude that the commission’s ruling is grounded in substantial evidence found in the administrative record. Its conclusion that the challenged bypasses are unjustified, and inconsistent with basic merit principles, is neither arbitrary, capricious, an abuse of discretion, nor a legal error.
Denial of MAMLEO’s motion to supplement the administrative record. Each of MAMLEO’s contentions in this appeal relies on MAMLEO’s assertion that the 1992 promotional examination was invalid for use in a strict rank order promotion system.18 There was, however, nothing in the record of the proceeding before the commission that supported this contention. Therefore, MAMLEO moved to supplement the administrative record with evidence it contended would demonstrate that a more valid scoring system for the 1992 promotional examination, which treated candidates who scored within a three-point band as functionally equivalent (banding), would have eliminated any bypass challenges.19 (As noted above, no minority candidate who was promoted in 1996 based on that examination scored more than two points less than a nonminority candidate who was bypassed.) We therefore need only assess the validity of the judge’s denial of that motion, as this issue decides MAMLEO’s appeal.
A motion for leave to present supplemental evidence pursuant [266]*266to G. L. c. 30A, § 14 (6), is addressed to the sound discretion of the judge. Northeast Metro. Regional Vocational Sch. Dist. Sch. Comm. v. Massachusetts Comm’n Against Discrimination, 35 Mass. App. Ct. 813, 817 (1994). In assessing whether a judge has abused his discretion, “we do not simply substitute our judgment for that of the judge, rather, we ask whether the decision in question ‘rest[s] on whimsy, caprice, or arbitrary or idiosyncratic notions.’ ” Boulter-Hedley v. Boulter, 429 Mass. 808, 811 (1999), quoting Bucchiere v. New England Tel. & Tel. Co., 396 Mass. 639, 642 (1986). See Long v. George, 296 Mass. 574, 578-579 (1937), quoting Davis v. Boston Elevated Ry., 235 Mass. 482, 497, 502 (1920) (abuse of discretion defined as view or action “that no conscientious judge, acting intelligently, could honestly have taken”).
Section 14 (6) provides:
“If application is made to the court for leave to present additional evidence, and it is shown to the satisfaction of the court that the additional evidence is material to the issues in the case, and that there was good reason for failure to present it in the proceeding before the agency, the court may order that the additional evidence be taken before the agency upon such conditions as the court deems proper. The agency may modify its findings and decision by reason of such additional evidence and shall file with the reviewing court, to become part of the record, the additional evidence, together with any modified or new findings or decision” (emphasis added).
MAMLEO argues that the additional evidence proffered is material to the issues presented in this case, see note 18, supra, but fails, under the plain terms of the statute, to show good reason for failure to present the evidence in the proceeding before the commission. MAMLEO explains that it was not a party to the proceedings before the commission, and thus cannot account for “why the underlying record [concerning promotional test validation and banding] was not presented along with the Superior Officers decision.” MAMLEO protests, however, that “the proper interpretation of c. 31 should not turn on a purported requirement that MAMLEO intervene in every agency proceeding involving the [police department].” The plain language of [267]*267the statute imposes no such requirement. The police department has not provided a “good reason” for its “failure” to present the banding evidence to the commission, and MAMLEO “cannot account” for the police department’s failure to present such evidence, so the statutory requirements for supplementing the administrative record are simply not met.
To permit MAMLEO to supplement the record in the circumstances of this case would be, in essence, permitting it to retry its claim on another theory. This is not a proper use of § 14 (6). See Fanion v. Director of the Div. of Employment Sec., 391 Mass. 848, 850-851 (1984). MAMLEO claims that it would have presented its defense of the bypass promotions before the commission differently from the method the police department chose, but both the plain language of § 14 (6) and our interpretation of § 14 (6) in the Fanion case prevent MAM-LEO from retrying the present case using a theory, (banding) and evidence that could have been presented during the original proceeding. The judge did not abuse his discretion in denying MAMLEO’s motion.20
[268]*268Conclusion. Because the other arguments raised by MAM-LEO rely in significant part on assertions based on materials excluded by the denial of MAMLEO’s motion to supplement the administrative record, we need not consider them here.21 The judgment of the Superior Court is affirmed.
So ordered.