Quality of life is an important patient-relevant end point. Originally viewed with some scepticism, the concept of quality of life has now been largely accepted internationally. Numerous methodologically sound ways of measuring have become available. An ever increasing number of studies include quality of life. Also, organizations providing care are becoming more interested, but including an assessment of quality of life when researching care provisions still requires greater attention. Results of research on quality of life can contribute to assessing needs, evaluate treatment, control quality and improve health within society.