Jones on Human Factors, Slide 1


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

3 of the worst
GadsdonES&S 150/55011.4%
3 of the best
LakeES&S 150/5503.53%
Santa RosaOptech0.36%

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?