Final answer:
The HDI measures education, gross national income, and life expectancy.
Step-by-step explanation:
The indicators measured by the HDI (Human Development Index) include:
1. Education: The HDI incorporates educational attainment, including adult literacy and enrollment in primary, secondary, and post-secondary education.
2. Gross National Income: The HDI takes into account the purchasing-power-adjusted per capita real GDP, which reflects the economic aspect of human development.
3. Life Expectancy: The HDI considers the average life span of individuals in a country as an indicator of overall well-being and health.