The Quality of Life Research Centre in Copenhagen measures quality of life according to seven criteria. These being: 1) a definition of Quality of Life; 2) an embedded philosophy of human life; 3) a theory that operationalises this philosophy; 4) quantifiable response alternatives; 5) technical checks (reproducibility, sensitivity, well-scaledness, etc); 6) validation through meaningfulness to investigators, respondents, and users; and 7) aesthetic appeal of the questionnaire. This is a very comprehensive approach to understanding quality of life and has appeal not only for theoretical and methodological construction of quality of life, but potentially provides a valuable guide to measurement (see: ้http://home2.inet.tele.dk/fclk/mql2.htm).