Montana constitution
Article XI: local government
Section 9

(2) The legislature shall require an election in each local government to determine whether a local government will undertake a review procedure once every ten years after the first election. Approval by a majority of those voting in the decennial general election on the question of undertaking a local government review is necessary to mandate the election of a local government study commission. Study commission members shall be elected during any regularly scheduled election in local governments mandating their election.