Learn more on to how to measure learning and the harmonisation of standards for measuring learning outcomes for reporting on SDG 4 Indicators 4.1.1 on minimum learning proficiency, 4.4.2 in digital literacy skills, 4.6.1 on functional literacy and numeracy skills, 4.7.4 in knowledge of environmental science and geoscience, and 4.7.5 in breadth of skills.