I got a call today from one of our most esteemed Opinio users (don’t worry, she knows who she is) wanting to know if she added a reminder message to an already sent invitation would those who have completed the survey also receive the reminder. We ran a quick little replication of this on a test survey by adding a reminder message *after* the initial invitation was sent. To our delight, those who already completed the survey did not receive the reminder.

Case closed.