Interactional competence is an important aspect of English speaking instruction because students need to respond, manage turn-taking, repair communication breakdowns, and maintain shared meaning with interlocutors. This study aimed to examine the effect of Information Gap Activity on the interactional competence of tenth-grade students at SMAN 1 Tanjungpinang. The study employed a quantitative pre-experimental approach with a one-group pre-test and post-test design. The participants were 36 students of class X-16 in the 2025/2026 academic year. Data were collected through paired speaking tests assessed by two raters using five indicators: responsiveness, turn-taking, repair, fluency, and accuracy. The data were analyzed using descriptive statistics, the Shapiro-Wilk normality test, and the Wilcoxon signed-rank test. The findings showed that the mean score increased from 57.44 in the pre-test to 75.94 in the post-test, with all students improving. The Wilcoxon test showed a significant difference (Z = -5.261; p < .001). This implies that Information Gap Activity effectively promotes interactive, collaborative, and meaning-oriented speaking instruction.
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