Voters prefer e-voting, but tech has limits, By Grant Gross, IDG News Service, March 21, 2008. Researchers found the error rate of the worst-performing machines was 3 percent in a simple task like voting for president and, in "more complex races," the error rate was higher.

• Voting Technology The Not-So-Simple Act of Casting a Ballot, by Paul S. Herrnson, Richard G. Niemi, Michael J. Hanmer, Benjamin B. Bederson and Frederick C. Conrad, Brookings Institution Press, 2008 c. 215pp.