The Human Development Index (HDI) is a tool used to rank countries based on their level of human progress. It was created by the United Nations Development Programme (UNDP) in 1990 to provide a broader view of well-being than just money or economic data like GDP.

The index is based on three main factors:

• Life expectancy: Measures how long and healthy people live.
• Education: Measures the average years of schooling and expected time in school.
• Gross national income (GNI) per capita: Measures the standard of living and wealth.

Each factor is measured on a scale from 0 to 1. The final HDI score is the average of these three. Countries are then placed into groups, such as very high, high, medium, or low development.

Advantages:

• Shows a better picture of life quality beyond just income.
• Allows us to compare development between different countries easily.
• Helps governments decide where to focus their support.

Limitations:

• It does not show inequality within a country, such as differences between rich and poor regions.
• It uses national averages, which can hide problems faced by specific groups like women or minority ethnicities.
• It treats all three factors as equally important, which some people may disagree with.