國家教育研究院

This study investigates urban–remote disparities in the science performance of Taiwanese eighth-grade students, particularly in matter-related domains, using an explanatory–sequential mixed-methods design. For the quantitative phase, we applied differential item functioning (DIF) analysis with Mantel–Haenszel statistics and logistic regression to the TIMSS 2019 science assessment, while in the qualitative phase, we employed think-aloud interviews and the repertory grid technique (RGT) with 12 students (6 urban, 6 remote) to explore cognitive structures. The quantitative phase identified 26 items (12.3% of 211) disadvantaging remote students, with DIF most pronounced in constructed-response formats and matter-related domains: Composition of Matter, Physical States and Changes in Matter, and Properties of Matter. The follow-up qualitative analyses revealed fragmented, associative cognitive structures in remote learners, marked by reliance on observable (macroscopic) properties rather than microscopic explanations, terminological confusion, microscopic gaps, and misconceptions, contrasting with urban students' hierarchical integration. Triangulation suggests that the observed disparities are linked to experiential constraints, potentially accounted for by hindered micro–macro connections. Our findings suggest that resource inequities may play a role in sustaining certain biases, indicating that targeted measures could help to make science education more inclusive. Based on these results, we tentatively outline possible educational interventions to improve equity in science education.