The Human Development Report (HDR), published yearly by the United Nations Development Programme (UNDP), assesses countries' development levels using several metrics:- Human Development Index (HDI): The primary tool for development comparison, the HDI integrates these three components: 1. Life expectancy: Reflecting health and life quality. 2. Education: Assessed via mean and expected years of schooling. 3. Income: Determined by Gross National Income (GNI) per capita.- Gender Development Index (GDI): This index evaluates gender disparities in human development.- Environmental Sustainability: Environmental factors are also considered in the HDR, recognizing the importance of sustainable development.- Inequality-adjusted HDI (IHDI): The IHDI is a recent metric that accounts for inequalities within each dimension of human development.