Oregon Constitution Art. VIII § 8

(1) The Legislative Assembly shall appropriate in each biennium a sum of money sufficient to ensure that the state's system of public education meets quality goals established by law, and publish a report that either demonstrates the appropriation is sufficient, or identifies the reasons for the insufficiency, its extent, and its impact on the ability of the state's system of public education to meet those goals.

(2) Consistent with such legal obligation as it may have to maintain substantial equity in state funding, the Legislative Assembly shall establish a system of Equalization Grants to eligible districts for each year in which the voters of such districts approve local option taxes as described in Article XI, section 11 (4)(a)(B) of this Constitution. The amount of such Grants and eligibility criteria shall be determined by the Legislative Assembly.