Khelifi, Djaouaher LaaliaZaidi, Khadidja2021-11-082021-11-082021http://hdl.handle.net/123456789/11805Syntactic complexity is an interesting aspect that governs the development of English as a foreign language learners, who still struggle with it and generally use simple syntactic structures while writing their essays, namely argumentative essays, and many factors intervene, such as personality. Specifically, the objective of this study is to investigate and compare the syntactic complexity within corpora of argumentative essays written by third year students (six introverts and six extroverts) at the department of English, Larbi Ben M'hidi University. In order to reach such aim, the personality type was checked using the online Mayers-Briggs Type Indicator personality test, and the analysis procedure was held using fourteen syntactic complexity measures in Lu's )2010( Second Language Syntactic Complexity Analyzer and in Kyle's (2016) Tool for Automatic Analysis of Syntactic Sophistication and Complexity, and the data was statistically analysed through the Hotelling's T2 test in the Statistical Package for the Social Sciences. It was found that syntactic complexity differs between the two groups, with introvert students having higher means in all of the measures, and the Hotelling's T2 test fits the data and was significant. The findings, thus, confirmed the alternative hypothesis which states that there is a significant difference in the syntactic complexity within the argumentative essays written by third year introvert and extrovert students. It was concluded that the introvert personality influences students' syntactic complexity while writing argumentative essays and boosts it more than its extrovert counterpart.enArgumentative essaySyntactic complexityOther