<![CDATA[This research aims to examine the effect of Problem Based Learning (PBL) Model and Educaplay Media on student's Vocabulary Mastery at grade X of SMA Negeri 2 Kisaran in 2024/2025 academic year. Using a quantitative method with a pre-test and post-test experimental design, this research involves the students in class X-1 and X-2 who are selected through a random sampling technique. Student's Vocabulary Mastery was assessed through pre-test and post-test results to determine the effectiveness of the PBL model and Educaplay Media in improving their understanding Vocabulary. The results show a significant increase in Vocabulary Mastery, with an average score increase of 9,2% in one group and 16.2% in the other group. Data analysis using the t-test revealed that the increase was significant, as evidenced by the t-scores value exceeding the critical value at the 0,05 significance level. With degrees of freedom (df) 70 and a significance level of 0,05, the t-scores value was obtained of 8,54 which was greater than the t-table, which was 1,667 (8,54 > 1,667). These results indicated that the alternative hypothesis (Ha) is accepted, which confirms the effectiveness of the PBL model and Educaplay Media in improving student's Vocabulary Mastery.]]>
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