This report focusses on the impacts of the pandemic on learning proficiency, specifically as measured by Sustainable Development Goal (SDG) Indicator 4.1.1. Over the last couple of decades, there has been a growing awareness of how crucial learning proficiency, especially that of younger children, is for human development. The evidence is clear that improvements in proficiency underpin future economic development, and the building of more cohesive and equal societies. The indicators on learning proficiency are among the most discussed indicators within the SDG framework. This report explains the impact of COVID-19 on learning losses for primary-aged children and the need for an effective response.