<![CDATA[This study aims to determine the effectiveness of the use of commercial facilities assisted by question and answer cards in improving the functional reading and writing skills of students with mild intellectual barriers (HI) in class V SLB in Yogyakarta. The research method uses a quasi-experimental approach with a one-group pretest-posttest design. This research was carried out in collaboration with three schools, namely SLB Negeri 1 Yogyakarta, SLB Negeri 2 Yogyakarta, and SLB Negeri 1 Bantul. The research subjects consisted of 20 students with mild intellectual barriers (HI) class V. Data collection was carried out through functional reading and writing ability tests, observation, and documentation. Test instruments that are validated by experts and demonstrate good validity and reliability. Data analysis used a paired t-test and an effect size test. The results showed a significant improvement in the functional reading ability of students with a tailed Sig. 2 value of 0.000, which was less than 0.05 (p < 0.05), and the functional writing ability of students with a tailed Sig. 2 value of 0.000, which was less than 0.05 (p < 0.05). The effect size test showed a Cohen's d value of 2.54 for reading and 5.08 for writing, indicating a large influence. The average pretest score for reading was 66.50 increased to 81.05 in the posttest. The average writing pretest score of 67.50 increased to 80.25 in the posttest.]]>
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