The National Association of Statutory Health Insurance Physicians (KBV) commissioned the research project that aims at answering the question whether there are enough physicians in the next 15 years. Due to the time range of the projection labour supply and demand have to be equally considered. The GWS is responsible for modelling the demand side that differentiate in 24 special fields. The number of patients (differentiated by age and sex) and the related treatments are forecasted until 2030 und determine the demand number of physicians. The most important driver is the demographic change influencing the number and the kind of medical treatments.