Despite the increasing use of English as a medium of instruction (EMI), teachers who teach at EMI schools encounter significant challenges, such as difficulties in teaching content-subjects in English and students' limited understanding of content presented in English. To examine the extent of these challenges, six early-full and 14 late-partial EMI science teachers from eight schools in Hong Kong were invited to participate in semi-structured interviews on the challenges they faced as teachers of EMI science subjects. A biographic approach was used to analyse the interviews, and the results showed that despite the metacognitive overlap between the two groups of teachers, there were noticeable differences in their pedagogical strategies. These findings suggest that the implementation of EMI instruction influences teachers' metacognition and pedagogical practices. Teachers' frequent use of Cantonese (L1) further suggest that English language skills are not as prioritised compared to the subject content. Further research is needed to investigate the complex and diverse factors that influence teachers' metacognition under EMI contexts. Copyright ©2023 Routledge.

With the rise of multilingualism and the use of a local variety of English in Hong Kong, the current article proposes a framework for EMI teacher training for university teachers ("WEMTT-Framework") to expose them not only to a theory of World Englishes but also a practicum of teaching in multilingual settings. Even though Hong Kong has been regarded as a trilingual (Cantonese-English-Mandarin) city where English is taught as a second language, the EMI teaching in Hong Kong is still highly exonormative-oriented. With an increasing number of studies revealing the possibility of EMI teaching with the help of multilingual and World Englishes elements, the current paper also explores how World Englishes and multilingualism help in the present EMI teaching environment. The framework and the discussion are not only applicable to Hong Kong but also places with similar multilingual settings, thus expanding to many Asian cities with colonial backgrounds. The paper ends with a call for action from educators and researchers to work on the implementation of teacher training and carry out further studies in different settings. Copyright © 2023 Language Institute, Thammasat University.

English-medium instruction (EMI) is taking hold within higher education in non-Anglophone settings, but there is insufficient research into the challenges students encounter when taking EMI courses online. This exploratory quantitative study conducted in Hong Kong examines the language and studying challenges faced by undergraduate students when in-person classes were suspended due to COVID-19. One hundred thirteen first- and second-year students completed a questionnaire, rating their perceived challenges in the areas of writing, speaking, reading, listening, and study skills. The results showed that they faced particular challenges with reading and study skills (especially self-motivation), as well as vocabulary range, which affected more than one skill. Corroborating existing research, students with less secondary school EMI experience reported greater challenges. As providing English for Academic Purposes (EAP) courses is a primary way to support the language skills of students in EMI settings, we offer guidance to EAP practitioners who seek to help their students overcome the challenges identified in this article. As online technology continues to deliver content in tertiary education, EAP courses must be closely aligned with the language and study skills needs of students in digital EMI environments. Copyright © 2023 by the authors.