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This study investigates the impact of a Realistic Mathematics Education (RME) intervention on students' mathematical problem-solving skills. A comparative evaluation study with a follow-up was conducted in a secondary school in Greece. The intervention engaged students in collaborative problem-solving. Overall, 124 10th-grade students participated in the study (74 in the intervention and 50 in the comparison group). A selection of items from the Programme for International Student Assessment (PISA) was used for the assessments. The post-test results showed that students in the intervention group developed more their problem-solving skills than those in the comparison group. The effect size was d = 0.31, CI 95% 0.11, 0.51. The intervention group also performed better in the follow-up assessment. This study shows the positive impact of the RME intervention on students' problem-solving skills and discusses how even a short-term intervention can affect students' performance in large-scale international assessments.
Ventistas et al. (Thu,) studied this question.