A longitudinal study at an English Medium Instruction university in Turkey: the interplay between English language improvement and academic success

Doğan Yüksel, Adem Soruc, Mehmet Altay, Samantha Curle

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Abstract

This article reports a quantitative empirical study that investigated whether English language proficiency increases over time when studying academic content through English Medium Instruction (EMI). It was also investigated whether an increase in proficiency predicts EMI academic achievement. Student English language test score data and Grade Point Average (GPA) data were collected from a public university in Turkey. Two academic subjects were compared: Business Administration (a Social Science subject, n=81) and Mechatronics Engineering (a Mathematics, Physical and Life Sciences subject, n=84). Results showed a statistically significant improvement in the English proficiency levels of both subjects over a four-year period of studying through English. Furthermore, this improvement predicted EMI academic achievement; meaning that the more proficient students became in English, the higher they achieved in their EMI academic studies. This provides evidence for policymakers, EMI practitioners, and language professionals around the world that English does improve when studying academic content through English, and that this improvement has a positive effect on content learning outcomes. Implications of these findings, and suggestions for further research are discussed.
Original languageEnglish
Pages (from-to)387-402
Number of pages16
JournalApplied Linguistics Review
Volume5
Issue number4
Early online date18 May 2021
DOIs
Publication statusPublished - 18 May 2021

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