United Nations Development Program (UNDP) use Human Development Index (HDI) That includes the income variable, and noneconomic variables can be divided as the country with the highest income. Medium-income countries and countries with a low income.
The HDI criteria is superior to the per capita income criteria because it incorporates both economic and non-economic factors that determine the quality of life. There are three classifications based on this criterion
1. HighHuman Development Countries (HDI .80),
2. Medium Human Development
Countries (.51HDI .79)
3. Low Human Development Countries ( HDI
.50).