Personal Canvassing - During each Saturday and Sunday for four weeks prior to the 1998 election, canvassers were sent to contact randomly selected registered voters. Canvassers appealed either to the citizen's sense of civic duty, neighborhood solidarity, or desire to cast a pivotal vote. Additionally, ordinarily canvassers close their appeal by saying, "We hope you'll come out and vote." For a random subset of the treatment group, the closing statement was augmented with the question, "Can I count on you to vote on November 3rd?"
Direct Mailings - The direct mail treatment group was separated into three subgroups and sent 1, 2, or 3 mailings, respectively. The mailings were sent out at three points in time: 15 days before the election, 13 days before the election, and 8 days before the election. The subgroup that was sent three pieces of mail was included on all three mailing dates; the subgroup receiving two mailings was sent mail on the two mailing dates closest to the election, and the remaining subgroup was sent mail eight days before election day.
Please refer to Gerber & Green (2000) for more details about the mail and canvassing interventions.