The project's goal is to develop a Swiss value set for the EQ5D Quality of Life measurement, which is presently lacking. EQ-5D is the most widely used instrument to assess the quality of life for health economic evaluations and in PROMs-implementations in general. To date, no EQ-5D value set has been derived for Switzerland, and economic evaluations of healthcare interventions based on EQ-5D data have been made using German or French value sets. Based on the international experience, whether the German and French populations’ preferences over different EQ-5D health states represent the Swiss population’s preferences well is questionable.