IEA INSIDER 2025
A RICH SOURCE OF INFORMATION FOR POLICYMAKERS The full results will be available on 9 December 2025, with an international release in Montenegro and the publication of the web-based TIMSS 2023 Longitudinal International Report. The TIMSS 2023 Longitudinal results provide more than trend reporting over time. They provide direct evidence of growth for the same students reassessed a year later, which helps in understanding how learning progresses and identify areas where education systems may show slower growth. The study’s main contributions are highlighting differences in growth linked to student background or school context, pointing to potential factors that support learning, and offering a solid, internationally comparable evidence base for discussions about educational fairness and quality. In TIMSS 2027, it is possible to re-assess the same students one year after the TIMSS 2027 assessment to investigate students’ learning gains over one year of schooling. Interested countries should reach out to IEA Amsterdam Director, Dr. Andrea Netten (a.netten@iea.nl). ■
UNDERSTANDING HOW STUDENTS LEARN: THE TIMSS 2023 LONGITUDINAL STUDY Alongside the work already underway for TIMSS 2027, the TIMSS 2023 Longitudinal Study is nearing completion and will conclude at the end of this year. This is the first time TIMSS has tracked the same students over time, providing fresh insights into how mathematical and scientific knowledge develop during a school year. By retesting the same students who participated in TIMSS 2023 one year later in 2024, the study measures actual learning gains and explores the factors that influence them. Nine education systems (Georgia, Italy, Jordan, Korea, Kosovo, Montenegro, North Macedonia, Slovenia, and Sweden) tracked students moving from Grade 4 to Grade 5; of these, three countries (Jordan, Korea, and Sweden) also followed students moving from Grade 8 to Grade 9. TRACKING PROGRESS OVER ONE YEAR Building directly on the TIMSS 2023 framework, the longitudinal study uses the same assessment methods and content. The key difference is the design: measuring the same students twice allows researchers to see how much their understanding of mathematics and science grew between 2023 and 2024. This approach helps uncover connections between academic progress and the various environments in which students learn, using information gathered from students, parents, teachers, and principals.
TIMSS Insights The TIMSS Insights series explores specific educational research topics using TIMSS data. Publications in this series use both mathematics and science achievement and contextual data to take a closer look at particular areas of research interest.
Download here: timss2023.org/insights/
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