Visual Human Development Index
The Human Development Index (or HDI) is a measure created to capture the level of development of a country. The HDI is made of three indexes: one for health, one for income, and one for education. Because of its tripartite nature, the same value of HDI can be obtained by substituting one indicator for another, for instance by increasing education and reducing life expectancy. The HDI tree is a visualization that allows comparison of HDI for different countries without the need to aggregate them into a single number, helping avoid the substitutability implied by the HDI definition.