http://homepage.cs.uiowa.edu/~dwjones/voting/cogel/
Jones on Human Factors, Slide 1

 

Florida 2000 Overvotes plus Undervotes
in using Optical Mark-Sense ballots

CountySystemOver+Under
3 of the worst
GadsdonES&S 150/55011.4%
EscambiaOptech3.75%
ColumbiaGlobal3.4%
3 of the best
LakeES&S 150/5503.53%
Santa RosaOptech0.36%
SeminoleGlobal0.12%

 
Global Global Election Systems Precinct Count
ES&S 150/550 Election Systems and Software Central Count
Optech Election Systems and Software or Sequoia Precinct Count

 

Some Questions

  • Why was there such a spread even within one system?
  • What was so good about Global's system?
  • What was so bad about the ES&S system?