“…The examination of construct-irrelevant variance and reliability evidence of international assessments such as the Program for International Student Assessment (PISA) and the Trends in International Mathematics and Science Study (TIMSS) administered across multiple countries and regions has become the central task for researchers and assessment professionals (Abu-Hilal et al, 2013; Arrindell et al, 2022; Huang et al, 2023; Espejo et al, 2022; Hambleton et al, 2005; Jia et al, 2018; Kamaruddin & MohdMatore, 2021; Marsh et al, 2013; Rias et al, 2021; Tan et al, 2021). This is because construct-irrelevant variance and reliability could be different across countries and regions due to unnecessary linguistic and cultural characteristics (Hambleton et al, 2005; Tan et al, 2021). Therefore, this study aimed to evaluate the language- and culture-related construct-irrelevant variance and reliability of the 2019 TIMSS sense of school belonging scale (SSBS) for grades 4 and 8 through expert reviews and item response theory (IRT) analysis of the existing data associated with the countries of China (Hong Kong), Singapore, Australia, and America.…”