Geofences are like virtual boundaries that trigger surveys on your phone when you enter, stay, or leave an area. Researchers used geofences to send surveys to people visiting job centers. They sent out 230 survey invitations and got 224 responses. The study shows that geofencing can be a useful tool for collecting survey data, but there were some issues with surveys being triggered incorrectly. Researchers learned from this and shared tips for improving future geofence studies.