FAHMIMROAH, FETI. 2016. English Department Students’ Beliefs toward Plurilingualism and Its Influence on English Academic Achievement and Language Learning Styles in Mulawarman University (under supervisors of Dr.Phil Maria Teodora Ping, M.Sc and Iwan Setiawan, S.Pd, M.Pd).

Samarinda: Unpublished Thesis. Mulawarman University. This research was aimed to investigate the relationship between students‘ belief toward plurilingualism and their English academic achievement, the relationship between students‘ belief toward plurilingualism and their language learning styles, to discover the reflection of correlation between students‘ belief toward plurilingualism to their English academic achievement, and to explain the reflection of correlation between students‘ belief toward plurilingualism to their language learning styles in campus activities.
The mixed methods approach with explanatory mixed method design was applied in this research. The research was conducted on the sixth semester students of English Department in Mulawarman University. The linear regression from this research revealed significantly positive relationship between students‘ belief toward plurilingualism and students‘ English academic achievement (r = .563, p < .05). Meanwhile, multinomial logistic regression gave result that there
was significant relationship between students‘ belief toward plurilingualism and students‘ language learning styles (p < .05).
Furthermore, the interview showed that students‘ view toward person who have ability in many languages and their self-confidence from the aspects of belief toward plurilingualism hold impartant role for students‘ English academic achievement. And the students‘ belief toward plurilingualism gives effect to their language learning styles, especially the frequency the students use English in campus environment, whether in classroom or outside the classroom.
For future researchers, it is better to involve the lecturers as the interviewee of the research to obtain the deeper insight and wider perspective, not only from students‘ point of view, but also from the lecturers‘. Then making research about influence of language learning styles to academic achievement can be beneficial for future researchers as well.
Keywords: Students‘ belief toward plurilingualism, English academic achievement, and language learning styles.