Based on the principle of solidarity and compulsory membership, the calculation of fees differs from private health insurance in that it does not depend on personal health or health criteria like age or sex, but is connected to one's personal income by a fixed percentage. The aim is to cover the risk of high cost from illness that an individual can not bear alone.
The maintenance and promotion of health is achieved through different combination of physical, mental, and social well-being, together sometimes referred to as the "health triangle." The WHO's 1986 Ottawa Charter for Health Promotion further stated that health is not just a state, but also "a resource for everyday life, not the objective of living. Health is a positive concept emphasizing social and personal resources, as well as physical capacities."