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The Asian EFL Journal
The purpose of this study was to investigate the effects of English-medium instruction in the
context of Taiwanese tertiary EFL and content area education. Due to the prevalence of
globalization, English has gradually become the only language of instruction in academia,
especially in Asia such as Taiwan. It is thus believed that this English only policy would
greatly benefit students’ L2 development as well as content knowledge acquisition.
However, this article claims that English-medium instruction could be ineffective and even
frustrating for students without professional teacher training programs. There were 104
students participated in this study at a university in northern Taiwan. The data were collected
from participants taking the course for 18 weeks, including students’ Pre-questionnaires and
an institutional listening & speaking test at the beginning, and Post-questionnaires, a semistructured
interview together with a final institutional listening & speaking test at the end.
The results indicated that students perceived and experienced the English-medium EFL and
content area instruction differently with various learning outcomes and attitudes. Also,
instructors were found to be of great importance to students’ learning results without any
exception. Overall, this study not only provides empirical evidence that English-medium
instruction is not always effective for ESL/EFL students without proper teacher training
programs, but also sheds light on what policy makers and language teachers need to consider
for creating a more effective and student-friendly English learning environment.
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Key words: bilingual education, English-medium instruction, tertiary education, L2
proficiency, teacher training program
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