This study examined the effectiveness of problem-based learning to improve students' writing skills. The study involved 20 seventh-grade students and used a pretest-posttest design. The findings confirm that problem-based learning improves overall writing skills but also helps develop critical thinking skills and systematic organization of ideas. The results showed a significant improvement in students' writing skills, with the mean score increasing from 56.15 on the pretest to 77.55 on the posttest, reflecting an increase of 21.4 points. The homogeneity test showed a significant value between the pretest and posttest groups of 0.179 (p>0.05). The paired t-test resulted in a t-value of -11.059 and was significant (p < 0.05). Although effective, this study has limitations in sample size and non-normal distribution of posttest scores. Recommendations for future research include the development of scaffolding models to support students with low adaptation, exploring the use of technology, and analyzing different types of texts. This study contributes to innovative writing teaching strategies in English education.
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