http://homepage.cs.uiowa.edu/~dwjones/voting/west02/
West02, Jones on End-to-End Accuracy Standards, Slide 4

Technical Terms for Paper-Based Systems:

Reliably detected mark

A mark that will always be counted as a vote by a vote tabulating machine.

Acceptable marks should be reliably detectable.

Reliably ignored mark

A mark that will never be seen as a vote by a vote tabulating machine.

Unacceptable marks should be reliably ignored.

Marginal mark

A mark that may or may not be counted, depending on the circumstances.

There should be no marginal marks.

The goals listed above are all unattainable!

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