To initiate a referendum, a total of 10% of all registered voters, plus 3% from every affected legislative district, must sign a petition. If the affected locality only has one legislative district, the 3% requirement falls to every municipality for a province-wide referendum, and for every barangay for citywide referendum. For barangay-level referendums, the requirement is 10% of all registered voters. For a constitutional plebiscite, 12% of all registered voters is needed, with 3% for all legislative districts, and that it could be exercised five years after its ratification on February 2, 1987, and once every five years after each plebiscite. A referendum is passed if it is approved by a majority of the votes cast; a defeat means the law sought to be rejected or amended remains to be in full effect.