The document discusses the Human Development Index (HDI), which is a composite statistic used to rank countries based on indicators of health, education, and standard of living. The HDI was created by Pakistani economist Mahbub-Ul- Haq in 1990 to assess overall social and economic achievement beyond just income. It is published by the UNDP and calculates dimension indices for health (life expectancy), education (adult literacy and enrollment), and income (GNI per capita) and combines them into a composite HDI score. Countries are ranked as having very high, high, medium, or low human development based on their HDI score.