 We can think of approval voting as a generalization of plurality rule. Under plurality rule, each voter votes for only one alternative—normally his or her most preferred one—and the alternative with the largest number of votes wins (or if there are several alternatives with an equal largest number of votes, they are tied for winning). Under approval voting, each voter can instead vote for any number of alternatives; again, the alternative with the most votes wins (or there may be ties). Plurality rule is like approval voting with a domain restriction to approval ballots in which each voter may approve of only one alternative. While it may seem counterintuitive to allow different voters to vote for different numbers of alternatives, note that approving of more alternatives does not necessarily give a voter more influence. In the limit, approving of all alternatives is equivalent to abstaining or approving of none of them, since such an approval ballot makes no difference to the relative vote tallies. Approval voting can also be interpreted as implementing a form of ‘yes’/‘no’ or ‘pass’/‘fail’ grading of the alternatives. For an alternative to ‘win’ or to be collectively ‘approved’, it must secure a maximal number of ‘yes’ or ‘pass’ grades.