<![CDATA[This study aims to test the effect of mind mapping on English vocabulary mastery in class X students of SMK X Jakarta. This study is an experimental study. The population in this study was 58 class X students of SMK X Jakarta, and a sample of 30 students was taken using the random sampling technique. Data collection in this study was through pre-tests and post-tests. In this study, the results of the post-test of the experimental class were obtained, namely an average value of 92.03, a median value or middle value of 92.7, a mode value or value that often appears of 93.5, a variance value of 8.267, and a standard deviation value of 2.87. The results of the post-test of the control class obtained an average value of 70.03, a median value or middle value of 70.7, a mode value or value that often appears of 71.7, a variance value of 7.695, and a standard deviation value of 2.77. The study’s results, through hypothesis testing, show that mind mapping influences the mastery of English vocabulary among class X students of SMK X Jakarta. This is indicated by the t-test value obtained by the t-count value of 21.65 and the t-table value of 2.048. So t-count > t-table (21.65 > 2.048) means that H0 is rejected and H1 is accepted. So, mind mapping influences the mastery of English vocabulary in class X students of SMK X Jakarta.]]>
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