Harmonized Learning Outcome Score

The Harmonized Learning Outcomes (HLO) indicator is a globally comparable measure of learning outcomes that combines results from international and regional standardized achievement tests in mathematics, reading, and science. Developed by the World Bank, it provides country-level scores to assess the quality of education by capturing cognitive skills across countries. This indicator bridges gaps in learning data for low- and middle-income countries, enabling the analysis of global learning patterns and their role in human capital development​.