This app collects data by asking participating GPs questions about their working week. Participants register to participate in the study for one measurement week. During that measurement week, participants will receive a message at least 3 and a maximum of 8 times a day asking which task they are currently doing. Participants can answer this question via the app by choosing one of the options shown (for example: “direct patient-related activity – telephone consultation” or “non-patient-related activity – (further) training”). After the measurement week, participants receive a short post-survey. The app helps Nivel collect reliable data from general practitioners. With this, Nivel maps the working week of the Dutch GP.