The Human Development Index (Human Development Index) is an indicator proposed by the United Nations Development Program in the "1990 Human Development Report" to measure the economic and social development level of the United Nations member states. It is a reference to the traditional The results of the GDP indicator challenge. The index value of the Human Development Index is determined by the composite of three sub-indicators: "life expectancy", "years of education" and "living standards".
The Human Development Index consists of three indicators: life expectancy, adult literacy rate and the logarithm of GDP per capita. These three indicators reflect a person's longevity level, knowledge level and living standard respectively.
HDI has absorbed the reasonable core of PQLI in methodology, added GDP per capita, converted it with PPP ($), and added average years of education to the knowledge variables. It can be said that HDI has transformed PQLI into A big step forward. Moreover, since its announcement, HDI has been continuously improved and changed in its construction and selection of the maximum and minimum values ??of each variable.