<![CDATA[This study aims to determine the effect of implementing Joyful Learning on the English vocabulary mastery of seventh-grade students at SMP Negeri 4 Gunungsitoli Selatan. The study employed a quantitative approach using a quasi-experimental method with a non-equivalent control group design. The sample consisted of 34 students, including 20 in the experimental class and 14 in the control class, selected through purposive sampling. Data were collected using pretests and posttests and analyzed through descriptive statistics, Normalized Gain (N-Gain), normality, homogeneity, and independent sample t-tests. The experimental class mean score increased from 56.60 to 67.40 with an average N-Gain of 0.25, while the control class increased from 46.79 to 48.43, with an average N-Gain of 0.03. The homogeneity test showed a significance value of 0.690 > 0.05. The hypothesis test yielded a t-value of 3.689 and a significance value of 0.002 < 0.05, indicating that Joyful Learning significantly improved students' English vocabulary mastery.]]>
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