Quote

"Voter registration can take many different forms: Periodic (e.g., prior to each election or every five years) or Continuous (all the time); Individual-Initiated (people must go to registration centers), State-Initiated (officials travel door-to-door), or State-Created/Automatic (names are taken from a separate database and no contact is required between people and election officials in order to register); and Compulsory (people must register to vote) or Voluntary (people have the choice to register or not)."

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NDI: Building Confidence in the Voter Registration Process: An NDI Monitoring Guide for Political Parties and Civic Organizations, p. 3

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Building Confidence in the Voter Registration Process: An NDI Monitoring Guide for Political Parties and Civic Organizations

Summaries

A voter list may be reliably established through a variety of acceptable methods, including periodic list, continuous list, or civil registry.