<![CDATA[Abstract - The purpose of this research was to find out whether there is a significant correlations between vocabulary mastery and self esteem on students’ speaking skill. The population of this study was X grade students majoring in natural science at SMU 64 Jakarta Timur, while the sample was 60 students were chosen randomly from those 3 classes. The writer used three instruments to gain the data : a vocabulary test, a speaking test, and a self esteem questionnaire. A quantitative analysis that included descriptive statistic and the correlation and regression analysis tests were conducted to answer the research hypotheses. The research results found that there is a significant simultaneous correlation between vocabulary mastery and self esteem on students’ speaking skill. This finding has proved the views which are vocabulary as a main language component and self esteem as affective factor have contributions in developing learning language especially fon speaking skill. Key words : Vocabulary Mastery, Self Esteem, Speaking Skill]]>
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