How does Vote Forward research work?
For each experiment, we find a large group of registered voters who share similar voting characteristics, and from that group, we randomly choose a small group of voters that will not receive a Vote Forward letter. This smaller group becomes the control group, and we don’t interact with them at all. The remaining voters, which is a much larger group, receive a letter encouraging them to vote. After the election we compare turnout data for the control group and the larger group. The groups are otherwise exactly the same, so the difference in turnout can be attributed to Vote Forward letters. We aggregate the data from different campaigns to determine how successful the letters are. You can read more on the Vote Forward Labs page