An undervote occurs when the number of choices selected by a voter in a contest is less than the minimum number allowed for that contest or when no selection is made for a single choice contest.
In a contested election, an undervote can be construed as active voter disaffection - a voter engaged enough to cast a vote without the willingness to give the vote to any candidate.
An undervote can be intentional for purposes including protest votes, tactical voting, or abstention. Alternately undervotes can be unintentional and caused by many factors including poor ballot design.
- 2005 Voluntary Voting System Guidelines Archived 2008-06-13 at the Wayback Machine., pA-18 U.S. Election Assistance Commission
- Alvarez, R. Michael; Katz, Jonathan N.; Hill, Jonathan N. (September 20, 2005). "Machines Versus Humans: The Counting and Recounting of Pre-scored Punchcard Ballots" (PDF). VTP Working Paper #32. Caltech/ MIT Voting Technology Project. Retrieved 2008-06-12.
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