Observational test

Operational test conducted on voting devices during an election by real voters to establish confidence that the voter verifiable paper record is produced correctly when assistive technology is used. Devices subjected to observational testing are used for normal collection of votes; the votes collected are included in the election tally.

Source: Election Terminology Glossary - Draft, National Institute of Standards and Technology (NIST), https://pages.nist.gov/ElectionGlossary/