<![CDATA[This study aims to determine the effect of using Cogni Anki Flash Card media on improving vocabulary mastery of eleventh grade students. Cogni Anki Flash Card is a learning tool or application that uses a spaced repetition method to help users remember vocabulary, use it grammatically and vocabulary information more effectively. This study uses a quantitative research design that uses experimental and control classes. The population of this study was eleventh grade students at SMK Negeri 1 Siantar in the 2025/2026 academic year. The researcher took two classes as samples in this study. The sample was XI DKV 1 as a control class consisting of 36 students where this class was only taught using conventional methods. While class XI DKV 2 consisting of 36 was an experimental class that was taught and received treatment from Cogni Anki Flash Card. Data were obtained through pre-tests and post-tests given to students in both classes. Data were analyzed using descriptive statistics, percentage increase in scores, normality and homogeneity tests, paired and independent t-tests, and effect size analysis. The findings revealed significant improvement in the experimental class, with the mean score increasing from 46.39 in the pre-test to 83.06 in the post-test. Based on the post-test classification, 5.6% of students achieved the “excellent” category, 44.5% were in “very good,” and 50.0% were in “good.” In contrast, the control class showed only modest progress, with the mean score increasing from 48.61 to 66.53. The distribution of the post-test results showed that 11.1% of students achieved the “excellent” category, 13.9% were “fair,” 27.8% were “fair,” and 8.3% were “poor.” Statistical analysis through paired and independent t-tests confirmed a significant difference between the two classes. The t-test for effect size calculation (Cohen’s d = 0.74) indicated a moderate effect on students’ vocabulary mastery. Furthermore, the t-test showed a p-value (2-tailed) of 0.000, which is below 0.05. Consequently, the null hypothesis (H₀) is rejected, and the alternative hypothesis (H₁) is accepted since the p-value (0.000) < 0.05. These findings indicate that Anki Flash Cards can be an effective tool to improve students' vocabulary mastery at SMK Negeri 1 Siantar]]>
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