This research aimed to find out whether the effectiveness of the Understanding by Design (UbD) approach in enhancing students' skills in writing descriptive texts. The study was conducted on Grade X students at SMK Tengku Amir Hamzah during the 2024/2025 academic year. A quantitative research method was employed, with data collected through essay-based tests. The findings revealed that the experimental group had an average pre-test score of 58.57, while the control group averaged 47.10, indicating a 20.62% improvement. The use of Understanding by Design in teaching descriptive writing proved to be effective in improving students’ performance. Data analysis was carried out using a t-test, which showed a t-score of 3.88, higher than the critical value of 2.012 at a 46-degree of freedom significance level. This result confirms that the alternative hypothesis (Ha) was accepted, and the null hypothesis (Ho) was rejected. Keywords: Writing Skil, Descriptive text, Understanding by Design
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