The Human Development Index (HDI) is a composite measure used to rank countries based on life expectancy, education, and income, emphasizing human well-being over economic metrics. Established in 1990 by Pakistani economist Mahbub ul Haq, the HDI has faced criticism for its perceived biases, measurement errors, and arbitrary classification thresholds. In response to these critiques, the UNDP revised the HDI methodology to improve the accuracy and credibility of its rankings.