http://homepage.cs.uiowa.edu/~dwjones/voting/cogel/
Jones on Human Factors, Slide 9
+ Precinct count systems can protect voters against inadvertant overvotes. This holds for lever machines, touch screens and mark-sense systems.
+ Central count systems are inexpensive, and vote-by-mail or absentee ballots are always subject to a central count.
+ Good instructions reduce need for protection!
+ A resolution board should examine every overvoted ballot!
(if the number of overvotes is close to the winning margin)+ The resolution board must operate under objective standards!
+ The resolution board must operate under the public eye!