Boyle, J.
The question presented is the proper interpretation of the first sentence of § 29 of the Headlee Amendment, Const 1963, art 9, §§ 25-34. The question arises against a backdrop of complex issues including equitable school financing, the intricacies involved in state school aid formulas, and the fiscal problems of the state. These underlying issues shape the arguments of the parties and amicus curiae and color their perspective. However, mindful of the fact that construction of a constitutional provision enacted as a result of voter initiative requires a special emphasis on the [242]*242duty of judicial restraint,1 our interpretation is ultimately drawn from the words of the amendment and our understanding of the purpose the voters sought to effectuate by ratification.2
The principal theories of the parties may be fairly summarized as a claim by local units of government that they are entitled to funding of mandated state programs on a unit by unit basis and a claim by the state that the Headlee obligation is met by funding a proportionate share of the mandated activity on a statewide basis wherever it is spent. Thus, having examined the language of §29 supporting their respective positions, Justice Levin’s dissent ultimately turns on the belief that the voters intended to preclude any shift of responsibility for mandated services from state to local governments, post, p 285, while the opinion of the Chief Justice implicitly accepts the proposition that the voters adopting the Headlee Amendment intended that the state could fulfill its Headlee obligation by discretionary redirection of amounts recaptured from mandatory programs, post, pp 274-275.
Because we conclude that the voters intended neither to freeze legislative discretion nor to permit state government full discretion in its allocation of support for mandated activities or services, we hold that the statewide-to-local ratio for calcu[243]*243lating the state’s funding obligation for existing services and activities under § 29 preserves voter intent by securing a minimum funding guarantee while simplifying calculations and avoiding inequitable anomalies. We further hold that social security coverage is not a state-required activity or service within the meaning of the Headlee Amendments.
i
Section 29 of the Headlee Amendment provides:
The state is hereby prohibited from reducing the state financed proportion of the necessary costs of any existing activity or service required of units of Local Government by state law. A new activity or service or an increase in the level of any activity or service beyond that required by existing law shall not be required by the legislature or any state agency of units of Local Government, unless a state appropriation is made and disbursed to pay the unit of Local Government for any necessary increased costs. The provision of this section shall not apply to costs incurred pursuant to Article VI, Section 18.
The plaintiffs in this case, fifty-one Michigan school districts and fifty-one taxpayers residing in each of those districts,3 contend that the state has [244]*244violated § 29 by reducing the state financed proportion of the necessary costs incurred by the plaintiff school districts in providing certain state-required activities and services.
When the Headlee Amendment was adopted by the voters of Michigan as part of the Michigan Constitution in 1978, state law provided for programs for special education, special education transportation, bilingual education, and lunch and supplemental milk.4 Since the adoption of the Headlee Amendment, the Legislature has appropriated funds to school districts pursuant to the State School Aid Act, MCL 388.1601 et seq.; MSA 15.1919(901) et seq., as amended annually. The act generally provides for two types of state funding: "restricted” and "unrestricted.” Unrestricted funds can be used for any school-related purpose authorized by law. Restricted or "categorical” funds are earmarked for specific programs, some of which are voluntarily provided by local districts, and some of which are mandated by state law.
The state allocates unrestricted funds according to a formula, set forth in § 21(1) of the act, that guarantees to each district a minimum level of funding per pupil. Generally speaking, the amount of unrestricted funds provided per pupil equals the difference between the amount guaranteed and the amount per pupil generated from local revenues.5 Districts are only eligible to receive unrestricted funds if the amount of revenue per pupil generated locally does not exceed the amount of funds guaranteed per pupil by the state. Districts that are so eligible are said to be "in-formula.” Districts [245]*245whose local revenues per pupil exceed the state-guaranteed amount are ineligible for unrestricted funds and are said to be "out-of-formula.”6
The act contains a "recapture” or "base revenue deduction” provision appearing in § 21(5) as amended by 1990 PA 207 and 1991 PA 118.7 This provision authorizes the "recapture” of funds tentatively allocated to an out-of-formula district8 under all other provisions of the act, including funds allocated for mandated categorical programs. The recaptured funds are withheld from out-of-formula districts and are available for distribution to in-formula districts in accordance with the act. The amount of the recapture or base revenue deduction is determined according to a complex set of formulas, the details of which are not relevant here.9
It is this recapture provision that, according to the plaintiffs, has resulted in a violation of § 29 of the Headlee Amendment by reducing the state [246]*246financed proportion of the necessary costs incurred by the plaintiff school districts in providing the activities and services mentioned above.
The plaintiffs also allege that the state has violated § 29 by reducing its prior one hundred percent proportional funding of the plaintiff school districts’ employer share of federal social security taxes paid on behalf of their employees. Since 1987, the state, in accordance with federal law, has required local school districts to remit all federal social security taxes directly to the appropriate federal agency. At the same time, the state has undertaken to appropriate to each district funds sufficient to cover the district’s employer share of such social security taxes. See MCL 388.1746; MSA 15.1919(1046), originally enacted by 1987 PA 128, as amended annually ("§ 146”); see also MCL 38.1341(9); MSA 15.893(151X9), as amended by 1989 PA 194.10
Before 1989, § 146 was included in a list of provisions under which the funds due school districts were exempted from recapture. See MCL 388.1621(5); MSA 15.1919(921X5), as amended through 1988 PA 318. The Legislature, however, in 1989 PA 197, removed § 146 from that list, thus subjecting to recapture the funds allocated for reimbursement of the social security taxes paid by out-of-formula districts.11 See MCL 388.1621(7); MSA 15.1919(921)(7), as currently amended.12 This, [247]
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Boyle, J.
The question presented is the proper interpretation of the first sentence of § 29 of the Headlee Amendment, Const 1963, art 9, §§ 25-34. The question arises against a backdrop of complex issues including equitable school financing, the intricacies involved in state school aid formulas, and the fiscal problems of the state. These underlying issues shape the arguments of the parties and amicus curiae and color their perspective. However, mindful of the fact that construction of a constitutional provision enacted as a result of voter initiative requires a special emphasis on the [242]*242duty of judicial restraint,1 our interpretation is ultimately drawn from the words of the amendment and our understanding of the purpose the voters sought to effectuate by ratification.2
The principal theories of the parties may be fairly summarized as a claim by local units of government that they are entitled to funding of mandated state programs on a unit by unit basis and a claim by the state that the Headlee obligation is met by funding a proportionate share of the mandated activity on a statewide basis wherever it is spent. Thus, having examined the language of §29 supporting their respective positions, Justice Levin’s dissent ultimately turns on the belief that the voters intended to preclude any shift of responsibility for mandated services from state to local governments, post, p 285, while the opinion of the Chief Justice implicitly accepts the proposition that the voters adopting the Headlee Amendment intended that the state could fulfill its Headlee obligation by discretionary redirection of amounts recaptured from mandatory programs, post, pp 274-275.
Because we conclude that the voters intended neither to freeze legislative discretion nor to permit state government full discretion in its allocation of support for mandated activities or services, we hold that the statewide-to-local ratio for calcu[243]*243lating the state’s funding obligation for existing services and activities under § 29 preserves voter intent by securing a minimum funding guarantee while simplifying calculations and avoiding inequitable anomalies. We further hold that social security coverage is not a state-required activity or service within the meaning of the Headlee Amendments.
i
Section 29 of the Headlee Amendment provides:
The state is hereby prohibited from reducing the state financed proportion of the necessary costs of any existing activity or service required of units of Local Government by state law. A new activity or service or an increase in the level of any activity or service beyond that required by existing law shall not be required by the legislature or any state agency of units of Local Government, unless a state appropriation is made and disbursed to pay the unit of Local Government for any necessary increased costs. The provision of this section shall not apply to costs incurred pursuant to Article VI, Section 18.
The plaintiffs in this case, fifty-one Michigan school districts and fifty-one taxpayers residing in each of those districts,3 contend that the state has [244]*244violated § 29 by reducing the state financed proportion of the necessary costs incurred by the plaintiff school districts in providing certain state-required activities and services.
When the Headlee Amendment was adopted by the voters of Michigan as part of the Michigan Constitution in 1978, state law provided for programs for special education, special education transportation, bilingual education, and lunch and supplemental milk.4 Since the adoption of the Headlee Amendment, the Legislature has appropriated funds to school districts pursuant to the State School Aid Act, MCL 388.1601 et seq.; MSA 15.1919(901) et seq., as amended annually. The act generally provides for two types of state funding: "restricted” and "unrestricted.” Unrestricted funds can be used for any school-related purpose authorized by law. Restricted or "categorical” funds are earmarked for specific programs, some of which are voluntarily provided by local districts, and some of which are mandated by state law.
The state allocates unrestricted funds according to a formula, set forth in § 21(1) of the act, that guarantees to each district a minimum level of funding per pupil. Generally speaking, the amount of unrestricted funds provided per pupil equals the difference between the amount guaranteed and the amount per pupil generated from local revenues.5 Districts are only eligible to receive unrestricted funds if the amount of revenue per pupil generated locally does not exceed the amount of funds guaranteed per pupil by the state. Districts that are so eligible are said to be "in-formula.” Districts [245]*245whose local revenues per pupil exceed the state-guaranteed amount are ineligible for unrestricted funds and are said to be "out-of-formula.”6
The act contains a "recapture” or "base revenue deduction” provision appearing in § 21(5) as amended by 1990 PA 207 and 1991 PA 118.7 This provision authorizes the "recapture” of funds tentatively allocated to an out-of-formula district8 under all other provisions of the act, including funds allocated for mandated categorical programs. The recaptured funds are withheld from out-of-formula districts and are available for distribution to in-formula districts in accordance with the act. The amount of the recapture or base revenue deduction is determined according to a complex set of formulas, the details of which are not relevant here.9
It is this recapture provision that, according to the plaintiffs, has resulted in a violation of § 29 of the Headlee Amendment by reducing the state [246]*246financed proportion of the necessary costs incurred by the plaintiff school districts in providing the activities and services mentioned above.
The plaintiffs also allege that the state has violated § 29 by reducing its prior one hundred percent proportional funding of the plaintiff school districts’ employer share of federal social security taxes paid on behalf of their employees. Since 1987, the state, in accordance with federal law, has required local school districts to remit all federal social security taxes directly to the appropriate federal agency. At the same time, the state has undertaken to appropriate to each district funds sufficient to cover the district’s employer share of such social security taxes. See MCL 388.1746; MSA 15.1919(1046), originally enacted by 1987 PA 128, as amended annually ("§ 146”); see also MCL 38.1341(9); MSA 15.893(151X9), as amended by 1989 PA 194.10
Before 1989, § 146 was included in a list of provisions under which the funds due school districts were exempted from recapture. See MCL 388.1621(5); MSA 15.1919(921X5), as amended through 1988 PA 318. The Legislature, however, in 1989 PA 197, removed § 146 from that list, thus subjecting to recapture the funds allocated for reimbursement of the social security taxes paid by out-of-formula districts.11 See MCL 388.1621(7); MSA 15.1919(921)(7), as currently amended.12 This, [247]*247according to the plaintiffs, has resulted in the unconstitutional reduction of the state financed proportion of social security taxes paid on behalf of their employees.
The plaintiffs filed their original complaint in the Court of Appeals, pursuant to § 32 of the Headlee Amendment,13 on September 13, 1990, and filed an amended complaint on October 9, 1990. The Court of Appeals, on November 9, 1990, dismissed the complaint for failure to state a cause of action under the Headlee Amendment.14 The Court reasoned that the plaintiffs had alleged only a reduction of the state financed proportion of their particular budgets on a unit-by-unit basis, and that § 29 would be violated only by a reduction of the state financed proportion of the necessary costs of any existing state-required activity or service as calculated on an aggregate, statewide basis, covering all relevant units of local government.15 The Court, on January 14, 1991, clarified [248]*248the reasoning of its earlier order and denied rehearing.16 The plaintiffs applied for leave to appeal to this Court, which we granted on April 23, 1991. 437 Mich 974.17
In our order granting leave to appeal, we directed the parties
to include among the issues to be briefed (1) whether the obligation of the state under Const 1963, art 9, § 29 should be measured by one of the following: (a) the ratio of total state aid for a required activity to total necessary costs for the required activity in the base year compared with the ratio of total state aid for the activity to total necessary costs for the activity in the year of [249]*249challenged funding; (b) the ratio of state aid to an individual local unit of government for a required activity to necessary costs of that unit for the activity in the base year compared with the ratio of state aid to the unit for the activity to the necessary costs of that unit for the activity in the year of challenged funding; (c) the ratio of total state aid for a required activity to total necessary costs for the required activity in the base year compared with the ratio of state aid to an individual local unit of government for the activity to the necessary costs of that unit for the activity in the year of challenged funding; or (d) such other ratios as advanced by the parties .... [Id.][18]
II
A
The first two sentences of § 29 provide:
The state is hereby prohibited from reducing the state financed proportion of the necessary costs of any existing activity or service required of units of Local Government by state law. A new activity or service or an increase in the level of any activity or service beyond that required by existing law shall not be required by the legislature or any state agency of units of Local Government, unless a state appropriation is made and disbursed to pay the unit of Local Government for any necessary increased costs.
Only the statewide-to-local district funding ratio for calculating the state’s obligation pursuant to § 29 gives full effect to the language and advances [250]*250the purposes that voters sought to achieve in ratifying the Headlee Amendment.
This approach requires an initial calculation of the proportion of statewide funding for a particular mandated activity to the total necessary costs of providing that activity.19 The necessary costs to each local unit in the funding year at issue are then calculated. Next, the proportion of state financed funding for the activity or service in the base year is compared to the proportion of funding provided to the district in the year at issue. The state is obligated to afford each unit providing the activity or service the same proportion of funding that the state provided on a statewide basis in the year that the Headlee Amendment was ratified.
The first sentence of § 29 speaks of "the state financed proportion,” suggesting a single proportion of multiple necessary costs for state-required activities and services. While not direct enough to be certain, the language suggests that the electors thought that a common percentage would be applied to measure the state’s obligation to fund each activity or service.20 The question is whether, in the year at issue, i.e., the payout year, each unit of local government is entitled to the same percentage.
In Durant v State Bd of Ed, 424 Mich 364, 379; 381 NW2d 662 (1985), we interpreted the language in § 29 to "reflect an effort on the part of the voters to forestall any attempt by the Legislature to shift responsibilities to the local government . . . .” Durant, supra, p 379. We explained that [251]*251the two sentences must be read together "[b]ecause they were aimed at alleviation of two possible manifestations of the same voter concern . . . Id. That reasoning suggests that the section was intended to impose an obligation on the state vis-ávis each unit of local government with respect to mandated activities or services as well as new requirements. The first sentence focuses on a single proportionate obligation by the state measured during the base year, i.e., the year that the Head-lee Amendment became effective. The only language in §29 that speaks directly to payment occurs in the second sentence, which requires a "state appropriation ... to pay the unit of Local Government for any necessary increased costs.”21 (Emphasis added.) This language references a singular unit and a singular governmental body. It suggests that the framers intended, and the voters understood, that the state’s obligation ran to each unit of local government. Thus, although the language is indirect, the section as a whole supports the state-to-local method.22
[252]*252The state-to-local formulation satisfies the voters’ intent in enacting the Headlee Amendment. When the voters ratified the Headlee Amendment, they sought to ensure that when the state mandates a program, funds are provided to the local government to pay for that program. The state-to-local method of calculating the state’s obligation achieves the voters’ desire to secure a minimum level of funding for the local government unit for mandatory programs and to link the mandating of programs with the necessity for taxing to pay for those programs. This approach also creates the appropriate balance between the state’s desire for discretion in allocating funds and the desire of the local units of government for minimum funding. The state-to-local ratio provides a uniform allocation of resources for mandatory programs. The state is free to supplement that minimum funding on the basis of its perception of need, but the local government is guaranteed its proportionate share.
The state-to-local formulation also simplifies the calculations necessary to determine the state’s obligation pursuant to § 29. Calculating the state financed proportion in the base year under the local formulation would entail numerous complicated questions regarding each governmental entity’s spending in the year that the Headlee Amendment took effect. In contrast, using a statewide method for calculating the percentage in the base year entails examining the necessary costs to the state in relation to the state’s proportionate share of funding, a single calculation.
Requiring the state to pay each local govern[253]*253ment the same percentage in the payout year will also avoid some of the anomalies present with a local base-year calculation. For example, if a district in existence in the base year was not providing a mandatory program when the Headlee Amendment took effect, this method would entitle the district to the same proportionate share as every other local unit that previously provided the programs. This formulation also simplifies funding where new districts are created by consolidation, or reorganization, or otherwise. If the newly organized district adds a program that was "mandated” when the Headlee Amendment took effect, any district providing the program is then entitled to the same proportionate share as every other unit providing the activity or service. Thus, the anomaly of funding at either zero or one hundred percent (pursuant to the second sentence of § 29) is avoided. New districts, like previously existing districts, would be entitled to the same proportionate share of state funding.
B
Section 29 of the Headlee Amendment embodies a dual view of government; the voters’ purpose comprehended balancing the rights and obligations of state and local governments. The state-to-state and local-to-local methods each fail for the same reason — they do not embody the dual approach that was reflected in the text and purpose. The state-to-state approach focuses on the first sentence of § 29 and its reference to a single statewide proportionate share. The local-to-local formulation stresses the second sentence of § 29 and its reference to payment to individual units of government. Rather than viewing these two approaches as embodying conflicting principles requiring a [254]*254choice, the state-to-local method gives effect to the supplementary principles embodied in the statute and most closely captures the full meaning and spirit of the text of § 29.
This dual purpose is reflected in the language of §25:
Property taxes and other local taxes and state taxation and spending may not be increased above the limitations specified herein without direct voter approval. The state is prohibited from requiring any new or expanded activities by local governments without full state financing, from reducing the proportion of state spending in the form of aid to local governments, or from shifting the tax burden to local government. [Const 1963, art 9, § 25.]
The text reflects the Headlee Amendment’s purpose of limiting the state’s discretion in several ways. First, it expresses the desire to prohibit the state from requiring new or expanded activities without fully funding them. The clause that embodies this purpose refers to funding for "local governments,” a plural reference, which implicitly suggests that funding must be provided to those local governments of whom the programs are required. Second, the language evidences a purpose of preventing the state from reducing "the proportion of state spending in the form of aid to local governments.” This language again includes a singular description of the state spending "proportion” along with a plural reference to the "local governments” that are receiving the aid. Finally, the language embodies an antishifting purpose that prevents the state from shifting "the tax burden to local government.” This text evidences the aggregate antishifting purpose embodied in the text of § 30. It also may be read to incorporate an absolute prohibition of any shifting to local gov[255]*255ernment, including the type of shifting advocated by the state and supported by Chief Justice Cavanagh.
The Chief Justice contends that the state financed proportion of the necessary costs of an existing activity or service does not mean the state financed proportion of the necessary costs of each unit of local government. Rather, he asserts that the state financed proportion of the necessary costs should be calculated on the basis of the necessary costs of all units of local government that provide the activity or service in the aggregate. Post, pp 266-267. Relying on the plural "units of Local Government” and the framers’ failure to include language specifying "each unit,” it is concluded that "the statewide-to-statewide interpretation appears to be the most logical and persuasive way to read the provision.” Id., pp 267-268. According to Chief Justice Cavanagh, the language of § 30 neither supports nor undercuts the interpretation that he favors for the text of § 29. Id., pp 271-273. Thus, he rejects Justice Levin’s assertion that when § 29 and § 30 are read together, it becomes apparent that § 29 was intended to prevent shifting in respect to the local units of government, while § 30 was intended to prevent shifting in respect to the local governments in the aggregate.
Chief Justice Cavanagh insists that the voters’ antishifting purpose is adequately realized by adopting a statewide-to-statewide formula for measuring the state’s § 29 obligation. Post, p 269. He observes that the unit-to-unit interpretation "require^] the state to subsidize . . . wealthier districts in perpetuity,” id., p 269, n 6, when no evidence suggests that voters sought to achieve that result. To the extent that this observation rests on the assumption that the state will not keep its promise to educate all of Michigan’s chil[256]*256dren because the political costs are too high,23 it is wide of the mark. To the extent it rests on the text and purpose of the first sentence of § 29, it is likewise not well taken. The state is not prohibited from redirecting other revenue in the interest of equalization, nor is it required to maintain mandatory programs in perpetuity. All that Headlee requires is that when the state mandates a program one factor in its determination of whether to require the activity or service must be the proportionate share of funding that the state must bear.
The state-to-state formulation is also contrary to implicit assumptions that this Court acted on in Durant. In Durant, we analyzed the state’s potential funding obligation under § 29 by considering the effect of funding decisions on the local unit of government. As the Durant plaintiffs correctly observed in an amicus curiae brief filed with this Court, both the parties, this Court, and panels of the Court of Appeals have proceeded on the assumption that § 29 had application to each unit of local government, and not in any aggregate sense. The rule of "common understanding,” as described by Justice Cooley, is applicable here. He explained that the constitutional construction to be given to a provision should give voice to the interpretation that " 'the great mass of the people themselves, would give it.’ ” Traverse City School Dist v Attorney General, 384 Mich 390, 405; 185 NW2d 9 (1971), quoting Cooley, Constitutional Limitations (6th ed), p 81. The parties, the Court, and the state assumed in Durant, litigation that closely followed the effective date of the Headlee Amendment, that a payout to each governmental entity was required. Although this assumption does not constitute a holding, it nevertheless constitutes some [257]*257evidence that the language of § 29 does not compel a state-to-state approach.24
Use of aggregate funding in the payout year as required by the state-to-state method frustrates the voters’ purpose as understood by this Court in both Durant and Livingston Co v Dep’t of Management & Budget, 430 Mich 635; 425 NW2d 65 (1988). We emphasized in Durant that the two sentences of § 29 must be read together. We explained that both "clearly reflect an effort on the part of the voters to forestall any attempt by the Legislature to shift responsibility for services to the local government, once its revenues were limited by the Headlee Amendment, in order to save the money it would have had to use to provide the services itself.” Id., p 379. We further explained that "while the voters were concerned about the general level of state taxation, they were also concerned with ensuring control of local funding and taxation by the people most affected, the local taxpayers.” Id., p 383. We rejected an interpretation of the scope of § 29 on the basis that it "would . . . force some taxpayers to supplement [258]*258the school district budgets of others” when the "supplementing taxpayers would have no control over how those funds would be spent . . . .’’Id.
State-to-state funding fails to protect local units of government from the need to increase taxes for state-required programs and permits the state to fund some state programs by shifting moneys away from certain local units of government and toward others at the state’s sole discretion.25 Pursued to its logical conclusion, this rationale would allow the state to meet its Headlee obligation by funding the cost of all mandated services in one county and none in the other eighty-two. The Headlee Amendment sought "to link funding, taxes, and control,” balancing rights and obligations at both the state and local levels. Durant, supra, p 383. Yet, the state-to-state method fails to effectuate the intended protection when viewed from the perspective of the local taxpayer._
[259]*259Ultimately Chief Justice Cavanagh concludes that "as long as the state does not attempt to shift its aggregate, statewide funding responsibilities” onto local units of government, it has satisfied the Headlee obligation established in § 29. (Emphasis deleted.) Post, p 270. Implicit in this analysis is the assumption that the drafters of the amendment were content to let the acceptability of discrete decisions within the aggregate responsibility, be evaluated in the polling place. It is this proposition that is most difficult to square with what we perceive to be the voters’ intent.26 If there is anything that the referendum was motivated by, it is that those who introduced it did not believe that the legislators’ determination of local responsibilities and its distribution of resources to local government could be fully harnessed by the political process. Although the statewide approach may ensure that the state saves no money27 from any shifting of funding between local units of government, it fails to protect all local taxpayers from the need to increase taxes to pay for programs over which they lack control. In other words, the statewide approach permits the state to shift funding from some districts to others while still requiring those districts to carry out mandated pro[260]*260grams. This separation of the taxing question from the programing question is contrary to one of the primary purposes of the Headlee Amendment. See Durant, supra, p 378.
The argument for adoption of a local-to-local method for calculating the state’s Headlee obligation pursuant to § 29 is also not persuasive. Justice Levin asserts that the words "taken as a group” should not be read into § 29 in contradistinction to § 30 where the framers included them, and concludes that the proper method to measure the state’s § 29 Headlee obligation is to compare the state financed proportion of local funding in the base year to the state financed proportion of local funding in the year at issue. He rejects the aggregate approach to the state’s obligation under § 29 because it would "effectively deprive many school districts of any protection under § 29” and force them to raise local taxes. Post, p 307.
Like the observations of the Chief Justice, these observations are inapposite. The question is not whether the local districts will be forced to raise local taxes to support their programs of choice, it is whether the state may mandate programs for which it does not pay a proportionate share. Justice Levin also maintains that, unless a local-to-local ratio is employed, wealthier districts will be presented with the "Hobson’s choice” of raising taxes or cutting programs contrary28 to the purpose of the Headlee Amendment. Id., p 308.
However, enforcing a local ratio in the base year would freeze funding at widely varying propor[261]*261tions29 that would guarantee disparities and severely limit the state’s ability to exercise discretion in the allocation of funds. We do not view the Headlee Amendment as being the voters’ expression of intent to freeze the status quo. Indeed, as we observed in Durant, "egregious mandated disparities would seriously affect the state’s ability to provide the basic necessities for a 'free education’ to all students . . . .” Id., p 384.30 Use of a local ratio in the base year as advocated by Justice Levin would freeze the state’s obligation in disparate proportionate shares, virtually mandating inequitable school financing. Varying shares of state funding not related to programing presumably reflected the relative wealth or need of the districts as determined by the Legislature. But, if the Headlee Amendment freezes those disparities, the proportionate share a local district obtains will no longer be on the basis of relative need, it will be [262]*262based on the fortuity of the district’s share when Headlee became effective. Nothing in the text of the Headlee Amendment or any statement of the voters’ purpose suggests that voters sought to freeze funding disparities regardless of changes in the wealth or need of a particular district over time.
iii
We also consider the plaintiffs’ claim that the state is obligated to pay the employer’s share of social security coverage for all school district employees. We agree with the Court of Appeals that plaintiffs’ social security coverage claim is not cognizable under § 29 of the Headlee Amendment.
Plaintiffs sought to frame their social security costs claim as though social security coverage constituted a separate state-required activity or service. However, social security coverage is directly imposed by federal law and therefore not required by state law within the meaning of § 29. Second, social security coverage does not constitute an activity or service within the meaning of § 29. Therefore, regardless of the method of calculating the funding ratio, plaintiffs’ claim for social security costs is defective.
CONCLUSION
The opinions filed today reflect what must honestly be acknowledged as an attempt to fill the gap in the text of Headlee.31 Thus, each illustrates the juridical reality that a commitment to judicial [263]*263restraint and a desire to give effect to the meaning as understood and ratified by the voters does not end the process of constitutional construction where the text is indeterminate. We must examine a host of factors such as the common meaning of the text, the structure of the provision, and the historical context in which the amendment was passed. Legal argument founded on multiple factors can be characterized as "cable-like.” Eskridge & Frickey, Statutory interpretation as practical reasoning, 42 Stanford LR 321, 351 (1990). The writers observe that "[t]he text, one probable purpose, some legislative history, and current policy each lend some — even if not unequivocal — support to the result. Each thread standing alone is subject to quarrel and objection; woven together, the threads” persuade that a particular result is in order. Id. The cable metaphor aptly describes the arguments in this case. The text, purpose, structure, and historical context all suggest that the strongest "cable” is woven from a state-to-local method. The theme of a single state obligation measured during the base year and the theme of state obligation owing to each local government are not logical alternatives but combinable strategies. So viewed, the strongest cable is that which winds together the Headlee Amendment’s dual focus into a single strong whole — the state-to-local method.
We remand to the Court of Appeals for further proceedings consistent with this opinion. The Court of Appeals order of dismissal was based on theories developed by it without the benefit of full argument by the parties. Although this Court has had the benefit of briefing and argument regarding the method of measuring the state’s obligation pursuant to § 29 and the social security coverage issue, there has been no opportunity to discuss the [264]*264remedy or to evaluate the viability of discrete claims of districts or individuals. We indicate no opinion regarding whether the method of measurement recognized today should be applied either fully retroactively or fully prospectively, or whether limited retroactivity is appropriate.
Brickley, Griffin, and Mallett, JJ., concurred with Boyle, J.