Post-It® note persuasion.

Garner (2005)
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Summary by 
Mark Egan

This experiment (n=150) tested the impact of various notes on the likelihood of a person completing a survey. For those who received only the survey and cover page the completion rate was 36%, compared to 48% for those with a handwritten message on the front-page and 76% when the survey was accompanied by a handwritten post-it note.