This year, we decided to do A/B testing on our annual fall appeal mailing. We typically send a brochure, but this year we did both a brochure and a letter with nearly identical content. We sent 2,783 of each to the mailing list which we split in half. The mailing list included donors from the past 5 years, current parents, and all alumni with a graduate degree. It’s early to tell which will end up being most successful, but early results show the returns have been 58% from the brochure appeal and 41% from the letter appeal.