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Precinct Counted Optical Scan (PCOS)
Precinct Counted
Optical Scan (PCOS) based system is a voting system where voters
mark paper ballots, typically with pencils, independent of any
machine, and hand carry their sleeved ballots to un-sleeve and insert
into scanners that optically sense their votes. Initial tabulation is
generally done at the polling place after the polls close. Ideally,
when a PCOS system is used, voters are warned of overvotes and
undervotes and are given a chance to correct mistaken ballots. (Any
system that cannot be configured to warn voters of over-votes and
under-votes will not be considered PCOS.)
Note: Given HAVA's requirement for accessibility, a PCOS system cannot
be used as the only means to vote; it must be supplemented with a
system that provides access for people with disabilities.
View a document describing scenario
assumptions for other voting device types.
View an all-in-one document describing the four primary voting device
types.
Other voting device types:
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