The criteria is at the top of the article.

-Political and social environment (political stability, crime, law enforcement, etc)
-Economic environment (currency exchange regulations, banking services, etc)
-Socio-cultural environment (censorship, limitations on personal freedom, etc)
-Health and sanitation (medical supplies and services, infectious diseases, sewage, waste disposal, air pollution, etc)
-Schools and education (standard and availability of international schools, etc)
-Public services and transportation (electricity, water, public transport, traffic congestion, etc)
-Recreation (restaurants, theatres, cinemas, sports and leisure, etc)
-Consumer goods (availability of food/daily consumption items, cars, etc)
-Housing (housing, household appliances, furniture, maintenance services, etc)
-Natural environment (climate, record of natural disasters)