Quality of Life
Summary
Quality of Life refers to the five bars that represent the overall well-being and satisfaction of your population in different aspect of society in that city. From top to bottom:
Happiness - The general measure of how content your Population is. Happier citizens generate more City Production.
Health - The citizens' well being. Healthier citizens contribute to city growth.
Knowledge - The intelligence and awareness of the population. Informed citizens generate more research.
Prosperity - More prosperous citizens provide more taxes, producing more wealth.
Security - This is a measure of how safe your citizens feel in their cities, empowering your military and boosting the strength of its forces.