The phrase “Quality of Life” has become quite common, and is used in both formal and informal ways. The fact that there is no commonly accepted definition does not detract from its utility or usefulness.
Suppose we start by defining “Quality of Life” as the description of the experiences and activities that are part of the normal enjoyment of living. That is, quality of life is multidimensional. The next step would be to identify what those parts or categories are. We can then compare our own quality of live to the quality of life of others. This comparison can be made between individuals, families, societies, nations, or any other grouping you choose.