A constitutional convention of elected delegates. The question of whether to hold a constitutional convention must be submitted to voters no later than ten years after the question was last submitted; see Article XVIII, § 2. (The question was last submitted in November 1994.) An amendment proposed by constitutional convention is ratified if it is approved by a majority of the votes cast and at least two-thirds of the votes cast in two of the three existing senatorial districts: Rota (District One), Tinian and Aguiguan (District Two), and Saipan and the Northern Islands (District Three). (See Article XVIII, § 5.)

Popular initiative. An amendment proposed by popular initiative is submitted to voters if petitions proposing the amendment are signed by at least fifty percent of the persons qualified to vote in the Commonwealth and at least twenty-five percent of the persons qualified to vote in each senatorial district; see Article XVIII, § 4. Like an amendment proposed by constitutional convention, an amendment proposed by popular initiative is ratified if it is approved by a majority of the votes cast and at least two-thirds of the votes cast in two of the three existing senatorial districts. (See Article XVIII, § 5.)

Legislative initiative. An amendment proposed by legislative initiative is submitted to voters if the legislative act proposing the amendment is approved by at least three-fourths of the members of each house of the legislature present and voting; see Article XVIII, § 3. In contrast to amendments proposed by constitutional convention or popular initiative, an amendment proposed by legislative initiative is ratified if it is approved simply by a majority of the votes cast. (See Article XVIII, § 5.)