✅ Psychology
Get a day and time, not just a yes
In a workplace flu-shot drive, employees whose reminder letter had a blank for the date and time they planned to go got vaccinated about four percentage points more often than those who only got the clinic details. Writing down a date alone did less, because naming the exact moment is what turns a vague intention into a plan people remember. Most “sure, I’ll do it” moments in marketing end without that step.