Citizen science is increasingly becoming a catch-all term for the many methods with which volunteers can participate in research. Citizen Science has become very relevant in science and science communication in various countries in recent years, especially in the Anglo-Saxon world. Due to the Swiss tradition of natural science societies dating back to the 19th century, nature observation by volunteers is a very well established field in this country. To date, the majority of existing citizen science projects in Switzerland come from the field of natural sciences. In recent years, however, many projects have also been developed in the medical sciences as well as in humanities and social sciences.