This study aims to analyze the effect of implementing the Discovery Learning model assisted by a series of pictures on the procedural text writing skills of Grade XI students at SMK Negeri 1 Kinali. The study employed a quantitative approach using a one-group pretest-posttest design. The participants consisted of 35 students. Data were collected through a procedural text writing test assessed based on text structure and linguistic features. Data analysis involved descriptive statistics, the Shapiro-Wilk normality test, and a paired-samples t-test. The results showed an improvement in students’ writing skills following the intervention. The mean score increased from 59.64 on the pretest to 90.60 on the posttest, representing an increase of 30.96 points. Improvements were observed across all indicators, including the purpose/general statement, procedural steps, restatement, imperative verbs, temporal conjunctions, time expressions, technical terms, and descriptions of tools or materials. The paired-samples t-test yielded t(34) = −37.562, p < 0.001, indicating a statistically significant difference between students’ performance before and after the intervention. These findings suggest that the Discovery Learning model assisted by a series of pictures can help students develop ideas, organize procedural steps coherently, and use the structure and linguistic features of procedural texts more accurately. Therefore, Discovery Learning assisted by a series of pictures can serve as a relevant alternative instructional approach for improving procedural text writing skills among vocational high school students.
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