City Quality of Life Indices are lists of cities that are ranked according to a defined measure of living conditions. In addition to considering the provision of clean water, clean air, adequate food and shelter, many indexes also measure more subjective elements including a city's capacity to generate a sense of community and offer hospitable settings for all, especially young people, to develop social skills, a sense of autonomy and identity.
The reason some cities appear in one ranking but not another is often related to the different criteria used between rankings, but more commonly it is related the difference in weighting given to similar factors.
