The COVID-19 pandemic is a health crisis without precedent in modern times. In The Netherlands, as elsewhere, it called for drastic measures to prevent an unmanageable spread of the virus. Convincing the public to follow these measures requires timely, clear communication. But other factors potentially also play a role in determining people’s behavior, including their risk perception (how likely they believe they, or their loved ones, may be affected) and media use (which news sources and media platforms they read). These influences may vary over time, as new facts (e.g., Boris Johnson on the IC) or new statistics (hospital admissions, death rates) become available. The aim of this project is to study the impact of the public’s risk perception and media use on adherence to COVID-19 preventive measures over time. From the onset of the pandemic, we participated in an international pilot study (including China, USA, South-Korea, Italy) to study these factors in different countries (with different governmental ...