Abstrak  Kembali
Nowadays, the process of teaching and learning to write was conducted unsuccessfully for several reasons. Some of them hampered on students’ language competence such as content, vocabulary, grammar, etc; however, only a few research studies investigated how the students’ ways to plan, react, and solve problem faced in their learning. Therefore, the writer was interested to prove her hypothesis and conduct a correlation study in order to investigate whether vocabulary mastery and reflectivity jointly together influence writing skill. The research was conducted at SMAN 10 Tangerang. The method of the research was a correlational study. The writer used a probability random sampling. 73 students out of 297 students of the eleventh grade in academic year 2016/2017 were chosen. Three are types of research instruments were used to collect the data. They were writing test, multiple-choice tests and questionnaire. Then the data were analyzed by multiple correlations and multiple regressions. Based on the results of the data analysis, there are three conclusions drawn: first, the influence of vocabulary mastery, reflectivity and writing skill are positive and strong as supported by multiple correlation coefficient R is 0.894. Second, the influence of vocabulary mastery and writing skill is positive and significant as supported by tstatistic 4.287 that is higher than tcritical 2.000. Third, influence of reflectivity and writing skill is positive and significant as supported by tstatistic 10.09 that is higher than tcritical 2.000.