<![CDATA[This study aims to analyze learning activities and the effectiveness of applying the problem-based learning (PBL) model using film media in teaching expository writing to tenth-grade students at SMAS NU Kaplongan in the 2024/2025 academic year. The research employed a quasi-experimental method with a non-equivalent control group design. The sample consisted of two classes: the experimental class, which used the PBL model with film media, and the control class, which used conventional methods (lectures). Learning activity data were collected through observation, while students' writing abilities were assessed using pretests and posttests. Observation results showed that the average learning activity score in the experimental class was 68.63% (high category), while the control class scored 54% (moderate category). An independent sample t-test yielded a t-value of 16.755 with a significance level of 0.00 < 0.05, indicating a significant difference in expository writing skills between the experimental and control classes. Additionally, the paired sample t-test produced a t-value of 39.26 with df = 24 and a significance level of 0.00 < 0.05, indicating a meaningful effect of the treatment on each variable. These findings suggest that the use of the PBL model with film media is effective in enhancing students’ expository writing skills. Therefore, problem-based learning using film media is an effective and engaging instructional strategy for improving writing skills.]]>
