Quality of life: input or outcome?

The focus of this column is to provide a brief overview of several conceptual analyses of quality of life along with their resulting definitions. A discussion of the more specific construct of health-related quality of life in terms of chronic illness is considered followed by an in-depth review of health-related quality of life measurement instruments. Finally, the idea of health-related quality of life considered as input to decision-making instead of designated as an outcome measure is proposed.