The Flemish Community of Belgium has one of the OECD’s most devolved education systems, but there are concerns among Flemish education stakeholders about the overall quality of education. In recent years, the Flemish government has initiated a series of reforms to strengthen the quality of education. These include the introduction of full cohort standardised student assessments in Dutch and mathematics. Students will take the assessments in Grades 4 and 6 at the primary level and in Grades 8 and 12 at the secondary level starting in 2024. This ambitious and innovative reform aims to strengthen and monitor the quality of education, with student results envisaged to inform improvement efforts at different levels of the system. As a follow up to the support provided by the OECD Strategic Education Governance Project, the Flemish Department of Education and Training asked the OECD Implementing Education Policies Project team to support the successful design and implementation of the standardised student assessment reform. This report presents the analysis, key findings and recommendations to help realise this objective.