<![CDATA[This study aimed to investigate the effect of WordWall on students’ English vocabulary mastery through a web-based learning approach. The study employed a pre-experimental design using a one-group pre-test and post-test design. The participants were 30 Grade XI students from one intact class of the Computer and Network Engineering department at SMK Muhammadiyah 1 Palu. Data were collected through a vocabulary test administered before and after the treatment and an observation checklist to support the description of the learning process. The treatment was conducted in six meetings using WordWall-based vocabulary activities focusing particularly on nouns and adjectives. The results showed a substantial improvement in students’ vocabulary mastery following the implementation of WordWall. The mean score increased from 42.33 on the pre-test to 80.67 on the post-test, representing a mean improvement of 38.33 points. A paired-samples t-test revealed a statistically significant difference between the pre-test and post-test scores, t(29) = 26.81, p < .001, with a very large standardized effect. The observation results further indicated active participation and positive engagement during the learning activities. These findings suggest that WordWall can serve as an interactive web-based learning approach to support English vocabulary learning, particularly in learning nouns and adjectives. However, because the study employed a one-group design without a control group, the findings should be interpreted as evidence of improvement following the intervention rather than definitive evidence of a causal effect attributable exclusively to WordWall.]]>
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