There are two questions presented by this appeal. One involves the scope of appellate review and the other, a more fundamental merit issue, concerns the question of “mandatory” collective bargaining under the Ohio Public Employees’ Collective Bargaining Act (“Act”). Notwithstanding that this case could easily be disposed of on the basis of the standard for appellate review of decisions of the administrative agency SERB, because it -is a matter of first impression for this court under the Act, the very substantial merit issue will also be determined. On either count, we find the judgment of the court of appeals to be in error and, therefore, reverse that judgment.
I
R.C. 4117.13(D) provides that in an appeal to the court of common pleas of a final order of SERB involving an unfair labor practice, “* * * [t]he findings of the board as to the facts, if supported by substantial evidence on the record as a whole, are conclusive.” Further, R.C. 4117.08(C) states, in part, that an “* * * employer is not required to bargain on subjects reserved to the management and direction of the governmental unit except as affect wages, hours, terms and conditions of employment * * *.” Thus, the question is: Was there substantial evidence to support SERB’S finding that appellee’s unilateral changes “affectjed]” the nurses’ conditions of employment and, therefore, provisions of the collective bargaining agreement?
The SERB hearing officer made twenty-six separate findings of fact. Finding number fifteen stated that “* * * [n]urses acquired the new responsibility for assisting the health aides by answering their questions and providing them guidance when requested.” Finding number twenty-five provided that “[a]s far as students [sic] health and nursing requirements, the health aides perform the same responsibilities as school nurses previously performed and in most instances presently perform.” The hearing officer recommended that “* * * the act of removing bargaining unit work from unit employees and transferring such to non-unit employees with the resultant affect [sic] of a change in the bargaining unit employees’ ‘conditions’ of employment” should be found to be subjects for mandatory collective bargaining.
SERB approved the findings of its hearing officer. Further, SERB found that “* * * by custom and practice the regular unit work was performed by nurses only and thus is encompassed in the collective bargaining agreement. Pursuant to [R.C.] 4117.08(A), any modification of a collective bargaining agreement becomes a mandatory subject of bargaining.” While appellee continued to have the same work performed by employees of appellee, that work was being performed by non-*260bargaining unit employees who had fewer qualifications than the nurses and were being paid less in wages and fringe benefits.
The common pleas court, in affirming the order of SERB, reviewed the record and concluded that “* * * SERB’S findings were supported by substantial evidence. * * *” In utilizing this standard of review, the trial judge complied with the dictates of R.C. 4117.13(D). Pursuant to that statute, the standard of review of a SERB decision on an unfair labor practice charge is whether there is substantial evidence to support that decision.
Further, a determination of whether a public employer’s unilateral action “affect[s] wages, hours, terms and conditions of employment” within the meaning of R.C. 4117.08(C) is generally a factual question which will vary depending upon the employer, employees and the circumstances of the case. Such disputes are properly determined by SERB, which was designated by the General Assembly to facilitate an amicable, comprehensive, effective labor-management relationship between public employees and employers. State, ex rel. Dayton Fraternal Order of Police Lodge No. 44, v. State Emp. Relations Bd. (1986), 22 Ohio St. 3d 1, 5, 22 OBR 1, 4, 488 N.E. 2d 181, 184-185. As long as SERB’S decision on such matters is supported by substantial evidence, it must be affirmed. Courts should not be required to intervene in every factual dispute between contesting parties.
Pursuant to R.C. Chapter 4117, unfair labor practice charges are first aired before SERB, one of its members, or a hearing officer. R.C. 4117.12(B)(1). The board member or hearing officer makes findings of fact and conclusions of law and then formulates a recommendation to SERB. R.C. 4117.12(B)(2). SERB then reviews the matter and issues its decision and order. R.C. 4117.12(B)(3). If SERB finds that an unfair labor practice has occurred (and it must be remembered that such charges may be brought by either employees or employer — R.C. 4117.11[A] and [B]), then SERB may use its considerable expertise in labor-management relations to resolve the matter. Upon the issuance of a final order, any aggrieved party may pursue an appeal to the court of common pleas. R.C. 4117.13(D). In reviewing the order, courts must accord due deference to SERB’s interpretation of R.C. Chapter 4117. Otherwise, there would be no purpose in creating a specialized administrative agency, such as SERB, to make determinations. The General Assembly could have provided for a direct appeal of a hearing officer’s decision to a court of common pleas, but such a course would have obviated the purpose for which SERB was established. To allow courts such latitude would invite many conflicting interpretations of R.C. 4117.08 and other provisions in the Act by various courts throughout Ohio.
It was clearly the intention of the General Assembly to vest SERB with broad authority to administer and enforce R.C. Chapter 4117. See, e.g., R.C. 4117.02, 4117.06, 4117.07, 4117.12, 4117.14, 4117.16 and 4117.19. This authority must necessarily include the power to interpret the Act to achieve its purposes. Accordingly, due deference must be afforded SERB’s determination that the reassignment of bargaining unit work to persons not members of the bargaining unit is a mandatory subject of collective bargaining under R.C. 4117.08. The trial court herein properly accorded the administrative agency such deference.
In reviewing an order of an administrative agency, an appellate *261court’s role is more limited than that of a trial court reviewing the same order. It is incumbent on the trial court to examine the evidence. Such is not the charge of the appellate court. The appellate court is to determine only if the trial court has abused its discretion. An abuse of discretion “ * * implies not merely error of judgment, but perversity of will, passion, prejudice, partiality, or moral delinquency.’ ” State, ex rel. Commercial Lovelace Motor Freight, Inc., v. Lancaster (1986), 22 Ohio St. 3d 191, 193, 22 OBR 275, 277, 489 N.E. 2d 288, 290. Absent an abuse of discretion on the part of the trial court, a court of appeals must affirm the trial court’s judgment. See Rohde v. Farmer (1970), 23 Ohio St. 2d 82, 52 O.O. 2d 376, 262 N.E. 2d 685.
The fact that the court of appeals, or this court, might have arrived at a different conclusion than did the administrative agency is immaterial. Appellate courts must not substitute their judgment for those of an administrative agency or a trial court absent the approved criteria for doing so.
Herein, there is no showing that the trial court abused its discretion. Accordingly, it was error for the court of appeals to reverse the judgment of the trial court.
II
The second, and more important, issue in this case is the scope of the bargaining obligation under R.C. 4117.08. The question presented is whether appellee must bargain, pursuant to R.C. 4117.08(A) and (C), regarding its decision to reassign work previously performed by bargaining unit nurses to non-bargaining unit health aides.
In enacting R.C. Chapter 4117, the General Assembly intended to bring about a balance in public sector employment relations. Dayton Fraternal Order of Police, supra, at 5, 22 OBR at 4, 488 N.E. 2d at 185. On the one hand, it is provided in R.C. 4117.08(A) that “[a]ll matters pertaining to wages, hours, or terms and other conditions of employment * * * are subject to collective bargaining * * (Emphasis added.) Subsections (B) and (C) of R.C. 4117.08 set forth extensive “management rights” reserved to the public employer. While these rights are broad, important and deserving of protection against unwarranted intrusion, they are, nevertheless, not unlimited.
Following the recitation of these rights in R.C. 4117.08(C) is additional language: “The employer is not required to bargain on subjects reserved to the management and direction of the governmental unit except as affect wages, hours, terms and conditions of employment * * *.” Accordingly, if a public employer intends to implement a decision which “affects” wages, hours, terms and conditions of employment of a bargaining unit, then the employer must bargain on the issue. This is so even if the question is reserved for managerial discretion.
In State Emp. Relations Bd. v. Bedford Hts. (1987), 41 Ohio App. 3d 21, 534 N.E. 2d 115, the city of Bed-ford Heights changed the work schedule for its fire fighters without bargaining with the union. SERB ordered the city to bargain with regard to the new schedule. SERB’S order was upheld by the court of appeals, which cited R.C. 4117.08(C) and held:
“Pursuant to this * * * [section], and contrary to the city’s contention, the city is required to bargain on the subject of scheduling, even though scheduling is a subject which has been reserved for managerial discretion, if the scheduling affects hours of employment. Changing the work schedule of fire fighters from twenty-four hours on and forty-eight hours off to ten-hour *262day and fourteen-hour night shifts certainly affects the hours of employment and therefore requires negotiation. ***” Id. at 24, 534 N.E. 2d at 118.
Some confusion arises based upon the use by the General Assembly of the word “affect.” The comparable federal statute to R.C. 4117.08(C) is Section 158(d), Title 29, U.S. Code. That section mandates collective bargaining with respect to wages, hours and other terms and conditions of employment. The “effects” of changes in any of these subjects must be bargained.
In choosing the word “affect,” as opposed to the word “effect,” the legislature has given us a verb rather than a noun as would be the case with the word “effect.”
The word “affect” in R.C. 4117.08 (C) suggests that management rights which “act upon” or “produce a material influence upon” working conditions are bargainable. See Webster’s Third New International Dictionary (1986) 35. Thus, a reasonable interpretation of R.C. 4117.08(C) is that where the exercise of a management right causes a change in or “affects” working conditions or terms of a contract, then the decision to exercise that right is a mandatory subject for bargaining.
Further, SERB’S holding concerning mandatory subjects of bargaining is consistent with the trend that has developed in the public sector in sister states involving reassignment of work or contracting out of bargaining unit work to persons outside the bargaining unit. See, e.g., Eugene Edn. Assn. v. Eugene School Dist. No. 4J (Ore. Emp. Rel. Bd., Apr. 25, 1977), Pub. Employee Bargaining (CCH), Paragraph 40,359; Matter of City of Bridgeport and Bridgeport Police Employees Local No. 1159 (Conn. State Bd. of Labor Rel., July 7, 1978), Pub. Employee Bargaining (CCH), Paragraph 40,954; Pennsylvania Labor Relations Bd. v. School Dist. of Millcreek Twp. (Penn. Labor Rel. Bd., Aug. 23, 1978), Pub. Employee Bargaining (CCH), Paragraph 41,006; Pennsylvania Labor Relations Bd. v. Phoenixville Area School Dist. (Penn. Labor Rel. Bd., Oct. 27, 1978), Pub. Employee Bargaining (CCH), Paragraph 40,643; Matter of East Windsor Regional Bd. of Edn. & Highstown Edn. Assn. (N.J. Pub. Emp. Rel. Comm., Aug. 29, 1979), Pub. Employee Bargaining (CCH), Paragraph 41,422.
A case that closely parallels the facts now before us is Matter of Piscataway Bd. of Edn. & Piscataway Twp. Edn. Assn. (N.J. Pub. Emp. Rel. Comm., June 30, 1978), Pub. Employee Bargaining (CCH), Paragraph 40,677. In Piscataway, work previously assigned to two bargaining unit school nurses was unilaterally reassigned to two non-bargaining unit health aides. The employer refused to bargain concerning the reassignment. As did SERB in the case before us, the New Jersey Public Employment Relations Commission found that the decision to reassign the work, as well as the impact on the bargaining unit nurses, was a mandatory subject of bargaining.
Thus, a review of the letter and intent of R.C. 4117.08, as well as the case law, demonstrates that SERB correctly concluded that the reassignment of bargaining unit work to non-bargaining unit persons is a mandatory subject of bargaining. The elimination of bargaining unit work comes within the meaning of “terms and conditions of employment.”
Therefore, we hold that a public employer must bargain with its employees regarding a management decision to the extent that such decision “affects wages, hours, terms and conditions of employment.” Thus, the reassignment of work previously per*263formed by members of a bargaining unit to persons outside the unit is a mandatory subject for collective bargaining under R.C. 4117.08(A) and (C). Contrary to appellee’s admonitions, this does not mean that management rights would be abrogated. Requiring appellee to bargain does not require that an agreement be reached. It does, however, provide a process whereby employees will be consulted about decisions which have a profound impact on them and, thus, industrial peace will be preserved and promoted.
The judgment of the court of appeals is reversed. The judgment of the trial court is reinstated and the cause is remanded to that court with instructions to enforce SERB’S final order.
Judgment reversed and cause remanded.
Sweeney, Locher and H. Brown, JJ., concur. Moyer, C.J., Holmes and Wright, JJ., dissent.