This publication titled ‘Rethinking Learning: A Review of Social and Emotional Learning for Education Systems’, published by the UNESCO Mahatma Gandhi Institute of Education for Peace and Sustainable Development (MGIEP) reviews the latest research on Social and Emotional Learning (SEL), its impact on student health and school climate and its transformative role in building happier classrooms. It seeks to inform and impress upon Member States the urgent need to mainstream social and emotional learning in education systems.