We describe the just-in-time, planned development of an online intervention promoting COVID-19-vaccination among University students, just before they were eligible for being vaccinated. We applied the six steps of Intervention Mapping within a time frame much shorter than usual, without losing scientific rigor. In step 1, we created a logic model of the problem. In step 2, we defined the behavioral outcome: taking the vaccination. We selected relevant determinants in an online survey and formulated change objectives. In step 3, we linked the objectives to theory- and evidence-based change methods and translated those into practical applications, taking into account the parameters for effectiveness. Students indicated preferring science-based information from experts;therefore, the final webpage, step 4, included four video-interviews, with a student asking questions to experts;the first two about worries &trust, and the second two on attitudes and perceived norms. In step 5, the intervention was fully implemented by the leadership of the University. Ideally in step 6, first-time interventions are systematically evaluated;however, not in times of COVID-19. This project was executed under unavoidable time pressure. Nevertheless, Intervention Mapping helped us developing an intervention that hopefully will positively affect students’ vaccination behavior in times of need.
Just-in-time, but still planned development of an online intervention to promote COVID-19 vaccination among university students;an Intervention Mapping approach