This study aims to determine whether window shopping has the potential to develop students' vocabulary in English, specifically within class VIII D at SMP Negeri 5 Mandai. This study integrates a quantitative methodology with a pre-experimental design. All eighth-grade students are included in the research population, and 31 students from class VIII D serve as a sample, which was selected randomly. To collect the data, a pre-test and post-test design was used, with the pre-test carried out before the treatment (the implementation of Window Shopping) and the post-test conducted afterward. SPSS was used to analyze the data. The use of Window-Shopping improved students’ vocabulary in English, according to the data analysis results. This can be proven by the significant difference shown in the results of the pre- and post-tests. The average pre-test score of the students was 52.7419, and the average post-test score was 89.1935. Since the T-test result was less than P, (0.001 < 0.05) the null hypothesis (H0) in this study is rejected, while the alternative hypothesis (H1) is accepted. Thus, it can be concluded that using Window Shopping as a learning method can enhance students’ English vocabulary.
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