The citizens’ initiative instrument allows a certain number of citizens to initiate a vote of the electorate on a proposal outlined by those citizens. The proposal may, for example, amend the constitution, repeal or amend an existing law, or adopt (or require the legislature to adopt) an entirely new law. The number of signatures required to place an initiative on the ballot varies, but is usually a proportion of the number of voters who voted at the most recent election, or a fixed number or proportion of registered voters. Depending on the design of the initiative process, if the ballot measure is passed by voters, it may become part of the state or country's law. The initiative process therefore provides citizens with an opportunity to directly frame the laws and/or constitution under which they live. The use of the initiative instrument varies substantially across different countries.