This study aims to describe the level of experience-based vocabulary mastery, the quality of imaginative story writing, and the relationship between these two variables among seventh-grade students at Pontianak Public Junior High School. The study employed a correlational research design. The study population consisted of 221 students, with a sample of 69 students selected using simple random sampling based on the Slovin formula. Data collection was conducted through observation, interviews, documentation, and tests of experience-based vocabulary mastery and imaginative story writing, all of which had been validated and found to be reliable. Data analysis was performed using descriptive and inferential statistics, specifically Spearman’s rank correlation. The results of the study showed that the average score for students’ experience-based vocabulary mastery reached 78.78 and fell into the “good” category, while the average quality of imaginative story writing was 80.29, which also fell into the “good” category. Spearman’s rank correlation test yielded a correlation coefficient of 0.793 with a significance value of 0.000 (p < 0.05). These findings indicate a significant positive relationship between experience-based vocabulary mastery and the quality of students’ imaginative story writing. This means that the better students’ experience-based vocabulary mastery, the higher the quality of the imaginative stories they write. Therefore, experience-based vocabulary mastery can be considered one of the factors that play a role in improving the quality of students’ imaginative story writing. This study shows that experience-based vocabulary mastery contributes to the quality of students’ imaginative story writing.
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