[410]*410DE MUNIZ, J.
The issue in this case is whether, in accordance with the text of the Custodians’ Civil Service Law (CCSL), ORS 242.310 to 242.640 and ORS 242.990,1 the Portland Public School District (the district) must employ custodians and whether the district must do so consistently with the merit system set out in that law. The Service Employees International Union Local 140 (Local 140) and its president, D. Grant Walker (collectively “petitioners”), sought a declaratory ruling from the Employment Relations Board (ERB) that the district’s proposal to terminate its existing custodial workforce and contract for custodial services violated the CCSL and, therefore, was a prohibited subject of bargaining. The ERB concluded that the CCSL did not prohibit the district from contracting for its custodial services. Local 140 appealed that decision, and the Court of Appeals concluded, like the ERB, that the district could contract for custodial services notwithstanding the provisions of the CCSL. Walter v. Scherzinger, 193 Or App 355, 89 P3d 1265 (2004). We allowed Local 140’s petition for review, and, for the following reasons, we reverse the decision of the Court of Appeals and the declaratory ruling of the ERB.
We take the facts and positions of the parties from the Court of Appeals decision:
“At all pertinent times, [the district] employed approximately 340 custodians, assistant custodians, and custodial helpers represented by Local 140. In early 2002, [the district] faced existing and projected budget deficits, which led to what interim superintendent James Scherzinger characterized as a ‘mission-threatening moment’ for the district’s schools. In response to that financial situation, on February 5, 2002, Scherzinger sent a letter to Walter notifying him that [the district] was ‘proposing to subcontract out all of the custodial services currently being performed by members of the bargaining unit represented by Local 140.’
“[The district] offered to bargain with petitioners over the proposal. Petitioners objected to the proposal but [411]*411agreed to bargain with [the district] while reserving objections to the plan. On March 18, 2002, the [district] board adopted a budget based on the assumption that [the district] would contract out all custodial services and lay off the Local 140-represented employees effective July 1, 2002.
“In April 2002, petitioners requested an expedited declaratory ruling from [the] ERB to determine whether the contracting proposal was a prohibited subject of bargaining. * * * Petitioners argued that, because the CCSL provides [that] ‘the only legal method by which the District may hire custodial workers,’ the contracting proposal would violate the law. The essence of petitioners’ argument * * * is that (1) the CCSL describes a comprehensive and fully integrated merit-based system for the appointment and promotion of custodians and assistant custodians providing services to [the district]; (2) [the district]’s private contracting proposal would, effectively, bypass those protections, rendering the entire statutory design a ‘dead letter’; and (3) the legislature implicitly, but necessarily, precluded such a wholesale circumvention of the CCSL.
“[The district] responded that the contracting proposal did not violate the CCSL because the CCSL does not prohibit independent contracting arrangements — and, indeed, expressly applies only to ‘employees’ of [the district]. * * * Thus, [the district] reasoned that persons performing custodial services pursuant to private independent contracting arrangements would not be ‘employees’ and, consequently, would not be subject to the CCSL.
“[The] ERB adopted [the district]’s position. Applying the template for statutory analysis prescribed in PGE v. Bureau of Labor and Industries, 317 Or 606, 611, 859 P2d 1143 (1993), [the] ERB concluded:
“ ‘The CCSL is intended to apply to custodians who are employees of the District. Nothing in the law states that the District cannot subcontract custodial services; rather, the CCSL applies if the District decides to hire custodians as employees of the District. Thus, there is no conflict between the CCSL and the District’s proposal. The District’s proposal does not require it to violate the CCSL, because, as a threshold matter, for CCSL to apply, the custodians must be District employees.
“ ‘Petitioners emphasize various provisions of the CCSL that state [that] the District ‘shall’ do certain [412]*412things in connection with the employment of custodians, such as, certain required actions and procedures [that] the civil service board must follow filling vacancies and establishing classifications. * * * Petitioners argue that these statutory provisions would be rendered meaningless if the District contracts out custodial services. It is true that[,] if the District employs no custodians, these provisions cease to have effect. Still, the CCSL clearly was intended to cover only those custodians in the District’s employ. There is simply nothing in the law that extends its reach to independent contractors of the District, or that prohibits the District from subcontracting custodial services. The mandatory language of the CCSL, relied upon by Petitioners, takes effect only if custodians are employees of the District.
“‘* * * Petitioner^] contend[ ] that[,] if the legislature had intended the CCSL to be optional, it would have said so, as it did in these other laws. Petitioners’ argument, however, ignores the definitions of the CCSL that clearly limit its applicability to employees of the District. As stated above, while the language of the CCSL contains many ‘shalls,’ these provisions apply only to custodians who are District employees.
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“ ‘Even if it were necessary to examine legislative history, the fact remains that nothing in the statute, or its legislative history, extends the CCSL’s reach to prohibit subcontracting. By the plain terms of the statute, its coverage is limited to employees of the District. If the legislature had intended to ban contracting with private firms for custodial services, or if it had intended to extend the coverage of the CCSL to private contractors of the District, it would have said so. It did not. We will not read a prohibition into the CCSL that simply is not there.’
“On judicial review, the parties reiterate their arguments to [the] ERB.”
Walter, 193 Or App at 357-59 (footnotes and citations omitted).
Like ERB, the Court of Appeals concluded that the CCSL does not prohibit the district’s proposal to terminate its [413]*413existing custodial workforce and contract for custodial services:
“[T]he CCSL does not preclude [the district’s private contracting proposal. Nothing in the CCSL’s text or pertinent context requires [the district] to hire persons providing custodial services as employees. Similarly, and concomitantly, nothing in the CCSL limits [the district’s ability to procure custodial services through contracts comporting with the public contracting laws. Rather, the CCSL merely provides that, in those circumstances in which [the district] does, in fact, employ persons as probationary or permanent custodians or assistant custodians, the appointment, retention, promotion, and discharge of those employees must comply with the requirements of the CCSL. Nothing more.”
Id. at 370.
In this court, petitioners reassert that the text of the CCSL requires the district to employ custodians and that it must do so consistently with the merit system described in the CCSL. Petitioners argue that, in enacting the CCSL the legislature intended to ensure the protection of children. According to petitioners, that intent is reflected in the text of ORS 242.550, which provides:
“The civil service board may require an applicant for a custodial position to furnish evidence satisfactory to the board of good character, mental and physical health, and such other evidence as it may deem necessary to establish the applicant’s fitness, including any information concerning a criminal conviction for a crime involving the possession, use, sale or distribution of a controlled substance, sexual misconduct listed in ORS 342.143(3), theft or a crime of violence. The board shall not approve the employment of any applicant unless the board is satisfied that the applicant poses no danger to school children.”
(Emphasis added.) Petitioners further argue that it is unlikely that the legislature would have mandated the existence of a civil service board and a secretary for the board, and, inter alia, that vacancies be filled within 10 days unless it intended “the civil service system to continue to apply indefinitely, as long as the Portland District had need of custodial services.”
[414]*414In response, the district argues that the CCSL, like many similar laws enacted in other states, was a response to custodial, and other jobs, being “subject to nepotism and to political and religious cronyism.” Additionally, and consistently with the decision of the Court of Appeals, the district argues that the CCSL, by its terms, applies only if the district decides to employ custodians. Therefore, the district argues, the CCSL does not preclude it from contracting with private parties for custodial services. In addition, the district argues that a 1965 amendment to ORS 332.155, adding what is now subsection (7), indisputably provides the district with the authority to contract for custodial services. That provision provides:
“A district school board:
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“(7) Shall furnish the schools with supplies, equipment, apparatus and services essential to meeting the requirements of a standard school and may furnish such other supplies, equipment, apparatus and services as the board considers advisable.”2
As the parties’ arguments make clear, this case presents a question of statutory interpretation. We therefore apply the statutory interpretation methodology set out in PGE v. Bureau of Labor and Industries, 317 Or 606, 610-12, 859 P2d 1143 (1993), to determine the legislature’s intent when it enacted the CCSL.
Pursuant to PGE, we turn first to the relevant text and context of the CCSL. 317 Or at 610. ORS 242.3203 [415]*415defines the terms “assistant custodian” and “custodian.” With certain exceptions not relevant here, ORS 242.320(1) defines “assistant custodian” as “any employee who works under the supervision of a custodian!.]” ORS 242.320(2) similarly defines “custodian” as “an employee of the school district” who has certain duties with respect to the supervision of school property. ORS 242.330(1) further provides:
“In all school districts having a population of 300,000 or more persons according to the last federal census, there is created a civil service board with jurisdiction over the appointment, employment, classification and discharge of custodians and assistant custodians in the employ of the school district.”
The district in question is a school district with a population of 300,000 or more persons.4 Notably, ORS 242.520(1) provides that “[n]o appointment or promotion to any position shall be made except as provided in the [CCSL].” The CCSL continues on to require “public competitive examinations to ascertain the fitness of applicants for beginning employment positions!,]” ORS 242.530, specifies the content of those examinations, ORS 242.540, requires the civil service board to scrutinize the character of all applicants to ensure that none “poses a danger to school children!,]” ORS 242.550, and sets out other requirements pertaining to the board’s management and termination of employees, ORS 242.560 to 242.640.
Most relevant to our analysis is the text of ORS 242.520(1). Petitioners argue that ORS 242.520(1) requires that the district observe the merit system set out in the CCSL [416]*416when acquiring its custodial services. The effect of that provision turns on the meaning of the terms “appointment” and “position.” Because the CCSL does not define those terms, we turn to a dictionary to ascertain the “plain, natural, and ordinary meaning” of those terms. PGE, 317 Or at 611. The relevant dictionary definition of “appointment” is the “designation of a person to hold a nonelective office or perform a function.” Webster’s Third New Int’l Dictionary 105 (unabridged ed 2002). Additionally, the relevant definition of “position” is “the group of tasks and responsibilities making up the duties of an employee [.]” Id. at 1769. ORS 242.520(1), therefore, properly can be understood as prohibiting the district from designating any person5 to hold an office or perform a function that involves the tasks and responsibilities of a custodial employee without doing so pursuant to the CCSL.6
The district asserts, however that the text of the CCSL applies only if the district chooses to employ custodial workers. We now address that contention. We begin with a brief discussion of the development of the statutes governing the duties of school districts as context for our understanding of the legislature’s intent when it enacted the CCSL in 1937.
In 1901, as part of a complete revision of the laws governing the Oregon public school system,7 the legislature enacted statutes addressing the organization of school districts and the duties of school boards. The revision required that all school districts be classified as “first class,” “second class,” or “third class” based on “the number of children of [417]*417school age, as shown by the last school census.” The Codes and Statutes of Oregon, title XXXIII, ch I, § 3364 (Bellinger & Cotton 1901). At section 3389, the new law set out the duties of the school boards and, as relevant here, provided, in part:
“The duties of school boards shall be:—
“4. They shall furnish their schools, from the common school fund, with fuel already prepared for use, chalk, janitor, brooms, blackboards, erasers, stoves, window curtains, reference books, library books and other apparatus for use in their schools: Provided, that the sum expended for this purpose shall not exceed fifteen per cent of the five-mill county school fund and the irreducible school fund apportioned to said district.”
Id. at § 3389 (emphasis in original). That provision remained virtually unchanged until 1941, when the legislature amended it to read:
“The general duties of the district school boards of the state of Oregon shall be as follows:
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“4. They shall furnish their schools with supplies, equipment, apparatus and services essential to meeting the requirements of a standard school and may furnish such other supplies, equipment, apparatus and services as the board deems advisable.”
Or Laws 1941, ch 155, § 1.8 Thus, it is clear that the substance of what is now ORS 332.155(7) has governed the administration of schools by district school boards since the late nineteenth century. Both the Court of Appeals, Walter, 193 Or App at 367 nil, and the district are incorrect in their assertions that that provision first became a part of Oregon [418]*418law in 1965. As a consequence, it also was incorrect to conclude that the later enactment indicated an intent by the legislature to provide the district discretion to avoid application of the CCSL to its custodial hiring decisions.
The 1901 act also included a section dedicated specifically to school districts of the first class, and, within that section, set out the duties of school boards in such districts. Those duties included “employ[ing] teachers, janitors, carpenters, etc.” The Codes and Statutes of Oregon, title XXXIII, ch I, § 3408(2) (Bellinger & Cotton 1901). They became duties “to be exercised in [the district school boards’] discretion” in 1931. Or Laws 1931, ch 92, § 1. The legislature also authorized school districts of the first class to solicit bids from private parties for the provision of certain supplies and services in the event that the cost for such items would equal or exceed five hundred dollars:
“In all such districts, when in the opinion of the board the cost of any lot of furniture, stationery, apparatus, fuel, buildings, or improvements or repairs to the same, will equal or exceed the sum of five hundred dollars, it shall be the duty of said board to give due notice, by publication in at least one daily newspaper published within said corporate limits, of their intention to receive bids for such lot of furniture, stationery, etc., and they shall determine the specifications for such bids and appoint the time and place for opening of all bids, which shall be public; and it shall be unlawful for any member of the school board to bid or to be an interested party in any bid before such board.”
The Codes and Statutes of Oregon, title XXXIII, ch I, § 3417 (Bellinger & Cotton 1901). That provision remained the same, with the exception of a slight modification in punctuation, until 1951. The legislature later repealed that provision in 1975 as part of a wholesale revision of the statutes governing public contracts. Or Laws 1975, ch 771, § 33.
By 1937, the legislature also had enacted provisions governing school districts of the first class with a population of 20,000 or more school-aged children. OCLA § 111-1211; OCLA §§ 111-1401 to 111-1409 (1937). Specifically, at OCLA section 111-1211, the legislature provided that, in such school districts, the board of directors would consist of seven directors, but in all other districts of the first class, the board [419]*419would consist of five directors. That population requirement increased gradually over time. The present analogue to that provision is ORS 332.015, which provides, in part, that “[t]he board of directors of a school district with a population of 300,000 or more * * * shall consist of seven members.”
The forgoing indicates that, by 1937, school boards in districts of the first class (1) had a duty to provide certain supplies and services9 to their schools; (2) had the discretion to hire necessary personnel; and (3) had a duty to receive bids for “any lot of furniture, stationery, apparatus, fuel, buildings, or improvements or repairs to the same” when the cost of such items might “exceed the sum of five hundred dollars [.]” In short, the legislature conferred on school boards in districts of the first class the authority to contract for essential supplies and services related to the maintenance of school property. Furthermore, the legislature recognized that school districts with large student bodies required more supervision and administration than did smaller school districts.
The legislature also recognized a distinction between “employees” and “independent contractors” in other statutes. For example, at OCLA § 102-609, the 1931 Legislative Assembly defined the term “employe [e]” to mean:
“any individual who otherwise than as copartner of the employer or as an independent contractor renders personal services wholly or partly in this state to an employer who pays or agrees to pay such individual at a fixed rate, based on the time spent in the performance of such services [.]”
OCLA § 102-608 specifically had excluded “any state, county, municipal corporation, town or other governmental division” from the scope of the term “employer” for purposes of that scheme, but, even so, the legislature clearly had made distinctions between employees and independent contractors by 1937. The legislature apparently likewise had not defined the term “independent contractor,” but at the time that the legislature passed the CCSL, this court understood that term to [420]*420mean “ ‘[o]ne who, exercising an independent employment, contracts to do a piece of work according to his own methods, and without being subject to control of his employer, except as to the result of his work.’ ” Streby v. State Indus. Acc. Com., 107 Or 314, 330, 215 P 586 (1923) (quoting Scales v. First State Bank, 88 Or 490, 496-97, 172 P 499 (1918)) “[T]he test for determining whether a person employed to do certain work is or is not an independent contractor, is the control which the employer reserves over the work and has the right to exercise. Where the person doing the work is an independent contractor [,] the will of the employer is represented in the result contracted for while the general control over means and methods is given to the contractor”).
It was against that legal backdrop that, in 1937, the legislature enacted the CCSL. OCLA § 111-1501 set out the name of the act, and OCLA § 111-1502 set out its scope:
“In all school districts of this state in which there is a population of 100,000 or more persons, according to the last federal census, there hereby is created a civil service board with jurisdiction over the appointment, employment, classification and discharge of custodians and assistant custodians in the employ of such school district. Custodians hereby are defined as employe [e]s of such school district, who shall have supervision of property, keeping the same in a sanitary condition and tending to the cleaning and operation of heating plants and other necessary work in the way of care and labor to keep the physical plants of the school board in maintenance and operation; and assistant custodians hereby are defined as those employe [e]s who work under such custodians’ supervision. Any assistant custodian receiving less than $60 per month as a wage shall not be deemed to come within the provisions of this act.”
(Emphasis added.) The provisions that followed set out, respectively, the number of commissioners who would constitute the board and the manner of their appointment, OCLA § 111-1503, a requirement that the board appoint a secretary, OCLA § 111-1504, and a requirement that all persons [421]*421already employed as custodians would become permanent employees without the need to take an examination, OCLA § 111-1505.
Furthermore, OCLA § 111-1506 provided:
“Upon the effective date of this act, the said civil service board shall classify, with relation to the character of work and the compensation attached thereto, all of the positions as custodians and assistant custodians in the service of the school board within the district. The places and employment so classified shall constitute the classified civil service of the school district, and after taking effect of this act, no appointments or promotion to any such place or position shall be made, except as herein provided.”
(Emphasis added.) OCLA § 111-1508 also prohibited certain persons from being eligible for appointment to a position:
“No person shall be eligible for examination and appointment unless he or she be a citizen of the United States and a resident of the said school district for at least one year immediately prior to applying for said examination. Such person must be able to read and write the English language. No person habitually using intoxicating beverages to excess or who has been an inmate of an insane asylum or who has been convicted of a crime involving moral turpitude shall be eligible for appointment.”
The legislature revised that provision in 1979, and, as noted above, added a specific requirement that, before the civil service board approves an applicant for employment, the board must be assured that the applicant does not pose a danger to school children. Or Laws 1979, ch 738, § 3 (now ORS 242.550).
OCLA § 111-1509 conveyed all control over examinations to the civil service board, and OCLA § 111-1510 set out parameters for registering and ranking eligible candidates. OCLA § 111-1511 further required, in part:
“Whenever there shall be a vacancy in any position in the said classified civil service, the school board, or its designated representative, immediately shall notify the civil service board thereof. The civil service board thereupon shall certify to such appointing authority the names and [422]*422addresses of the three eligible candidates standing highest upon the register for the class or grade to which such position belongs [,]”10
For the reasons discussed below, the foregoing provisions demonstrate that, when it enacted the CCSL, the legislature intended to enact a comprehensive statutory scheme to govern the selection of custodial workers in school districts with “a population of 100,000 or more persons [.]” The 1937 Legislative Assembly also chose to confer upon the civil service board jurisdiction over the employment of such custodial workers before defining the terms “custodian” and “assistant custodian.” The legislature then defined such personnel, in part, as “employe [e]s” of the school district. The question that we must resolve is whether the legislature’s intent was to limit the persons to whom the CCSL would apply, rather than to define the legal status of custodial workers who the civil service board hired to fill vacant district positions.
Pursuant to ORS 174.010, this court must construe statutes in a manner that will give effect to all provisions at issue. We think that the choice of the 1937 Legislative Assembly to define the terms “custodian” and “assistant custodian” as “employe [e]s,” taken with its mandate that, “after taking effect of this act, no appointments or promotions to any such place or position shall be made, except as herein provided [,]” 11 demonstrates that the legislature intended to define the legal status of such workers.
That proposition is supported by the fact that the legislature did not base the civil service board’s authority on an employment relationship; i.e., whether the individuals who perform custodial work within the school district are [423]*423employees of the school district. Instead, in creating the CCSL, the legislature invested the civil service board with authority at a much more fundamental level. As ORS 242.510 makes plain, the civil service board’s authority does not begin with the type of worker used to fill a custodial position in a school district; instead, the civil service board’s authority begins with the custodial positions themselves:
“The civil service board shall classify, with relation to the character of work and the compensation attached thereto, all positions in the service of the school board within the district including those under the supervision of a custodian except those described in ORS 242.320(1)(a), (b) or (c). The positions so classified shall constitute the classified civil service of the school district.”12
The legislature’s reference to “all positions in the service of the school board” in the statute’s text underscores several aspects of the CCSL that are important here. First, “positions” can exist even when they are vacant and regardless of the category of workers who ultimately fill them, be they employees, subcontractors, or even volunteers. In creating authority in the civil service board to classify such “positions” by character of work and compensation, the legislature essentially granted the civil service board authority over the concept of custodial positions within the qualifying school districts as much as it granted the civil service board authority to make the concept a concrete reality through a classified civil service. As a result, filling the positions at issue here with nonemployees would not divest the civil service board of its statutory authority, because, under the CCSL, the civil service board’s authority begins with the position itself.
Second, the legislature could have referred to such positions as being “in the employment of the school board” when it drafted ORS 242.510, but it did not. Instead, the legislature drafted a statute that referred to positions “in the service of the school board.” Giving the term “service” its [424]*424plain meaning, the word is most properly understood in the context used here as simply “the performance of work commanded or paid for by another.” Webster’s at 2075. As a result of that broad definition, just as a “position” can conceivably be filled in a variety of ways — by employees, subcontractors, or volunteers — so too, the “service” to the school board provided by those positions can also be realized in a variety of ways, none of which appear limited to relationships based only on employment.
Simply put, ORS 242.510 invests custodial civil service boards with a broad authority that begins with board classification of the applicable custodial positions within a qualifying school district. That, in turn, translates into statutory authority over all appointments and promotions within the custodial classified civil service. ORS 242.520 provides:
“(1) No appointment or promotion to any position shall be made except as provided in the Custodians’ Civil Service Law. All appointments to beginning employment positions in the classified civil service shall be made according to fitness, to be ascertained by open competitive examinations. All promotions in the classified civil service shall be made according to merit in service, fidelity in service and seniority in service.
“(2) No person shall be appointed or employed by a school board under any title not appropriate to the duties to be performed.
“(3) The appointing authority shall immediately notify the board of any appointment or discharge.”
Of course, as ORS 242.510 makes clear, not all custodial positions are part of the classified civil service. Exceptions — listed in ORS 242.320(1) — exist for positions where workers either work less than eight hours per day, work less than 12 months a year, or receive an hourly pay rate. Still, even though such positions are not part of the classified civil service, the civil service board nevertheless maintains a degree of authority over who will fill them. As the text of ORS 242.550 suggests, applicants for custodial positions in general, not just those subject to the classified civil service, are subject to civil service board’s scrutiny during the hiring process:
[425]*425“The civil service board may require an applicant for a custodial position to furnish evidence satisfactory to the board of good character, mental and physical health, and such other evidence as it may deem necessary to establish the applicant’s fitness, including any information concerning a criminal conviction for a crime involving the possession, use, sale or distribution of a controlled substance, sexual misconduct listed in ORS 342.143(3), theft or a crime of violence. The board shall not approve the employment of any applicant unless the board is satisfied that the applicant poses no danger to school children.”
(Emphasis added.) The legislative intent behind that provision is clear. ORS 242.550 prohibits the civil service board from approving any applicant’s employment unless the board satisfies itself, from its review of the applicant’s fitness, that the applicant poses no danger to the school children in the district’s care. The beneficiaries of that requirement are the district school board and the public, especially parents and students. The district’s proposed interpretation of the statute thwarts that legislative intent because it would authorize the district to contract with custodians who have never established, to the satisfaction of the civil service board, that they are fit for service and pose no danger to school children. That approach simply would ehminate the assurance of the safety of school children that ORS 242.550 was designed to secure.
Read together, the statutes discussed above establish the breadth of the civil service board’s authority over custodial positions within a qualifying school district. At the same time, they underscore a conscious legislative choice to limit the authority of certain school districts in the course of filling those positions. Moreover, because the CCSL governs a specific subgroup of school district personnel and was enacted after the text of ORS 332.155(7)13 first became a part of Oregon law, we deem the district’s continued obligation to [426]*426provide “essential services” to its schools as being subject to the terms of the CCSL. See Balzer Mch. v. Klineline Sand & Grav., 271 Or 596, 601, 533 P2d 321 (1975) (noting that, when the text of a statute is inconsistent with a previously enacted statute, the later statute will prevail).
We conclude that, when the 1937 legislature defined custodians and assistant custodians as “employe [e]s,” it intended to define the legal status of those workers. That definition served to facilitate the civil service board’s control over that workforce. Finally, ORS 242.520(1) requires the district to employ custodians pursuant to the terms of the CCSL.
The decision of the Court of Appeals is reversed. The declaratory ruling of the Employment Relations Board is reversed.