Development

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Human development index is the quality of life-index prepared by UNDP. It has mainly three indicators:

1. Life Expectancy at Birth: It denotes the average expected length of life of a person at the time of birth.
2. Gross Enrolment Ratio: It shows enrolment ratio in primary schools, secondary schools and in higher education.
3. Per Capita Income: It is calculated in dollars for all countries so that it can be compared.

Adding all the three indicators and dividing by 3, gives the human development index:
$\mathrm{HDI} = \frac{\mathrm{LE} \mathrm{Index} + \mathrm{GER} \mathrm{Index} + \mathrm{Per} \mathrm{Capita} \mathrm{Income} \mathrm{Index}}{3}$,  [LE denotes Life Expectancy,  GER denotes Gross Enrolment Ratio]

Human Development Report published by UNDP compares countries based on the educational levels of the people, their health status and per capita income.