OCDE (2021). The learning gain over one school year among 15-year-olds. An analysis of PISA data for Austria and Scotland (United Kingdom). OCDE. https://doi.org/10.1787/d99e8c0a-en https://www.oecd-ilibrary.org/fr/education/the-learning-gain-over-one-school-year-among-15-year-olds_d99e8c0a-en