Voting

[A] small number of people expressed strong disagreement with the voting methods tested, while also saying or otherwise indicating that they did not understand them.

Antoinette Baujard and Herrade Igersheim, Framed field experiments on approval voting: lessons from the 2002 and 2007 French Presidential Elections, in Jean-François Laslier and M. Remzi Sanver (eds.) Handbook on Approval Voting, Berlin, 2010, p. 365