This article reports on the findings from a technology-enhanced teacher learning project where the SETTVEO app (Self Evaluation of Teacher Talk through Video Enhanced Observation) was used to support teachers’ reflective practices and professional development. Participants in the project were a group of 40 student teachers (ST) from Hong Kong, who took part in a teaching practicum taught online owing to COVID-19 restrictions. They formed online professional learning communities (PLCs) with peers and tutors, shared their class recordings (tagged using the on SETTVEO app), and reflected on their teaching through weekly discussions. This study aims to characterize teacher learning mediated by video technology and dialogue, and to evaluate the impact of the app on STs’ reflective practices and emerging Classroom Interactional Competence (CIC, Walsh 2013). In this article, we focus on an individual ST's development over a period of eight weeks. Two sources of data are transcribed and analysed using an applied Conversation Analysis (CA) method: the first records the teacher's interactions while teaching, the second their dialogic reflections based on observations of these class recordings. Findings from the study enhance our understandings of the role of technology in influencing classroom practice and highlight its importance in promoting teacher noticing and professional development. © The Author(s) 2023.

The use of English in international communication has focused scholarly attention on L2 learners' development of interactional competence (IC), that is, the ability to co-construct interactions purposefully and meaningfully in specific contexts. Under Hong Kong's bilingual education policy, students mainly learn and speak English in two classroom contexts: (1) English language and (2) English-medium-instruction (EMI) content-area subject lessons, which may contribute to their IC development. This study compared the English-speaking/learning experiences of students in these two classroom settings in three Hong Kong secondary schools. Task-based language teaching (TBLT) was the recommended teaching approach in the English language subject in all these schools, but they adopted different medium-of-instruction arrangements in content-area subjects. Their students also had different academic attainments. The investigation adopted a case study approach consisting of a questionnaire and semi-structured focus group interviews (N = 160). Our findings suggest that students generally lacked opportunities to speak English, regardless of the specific school-based policies. The higher-proficiency students were given more opportunities to speak English in group/pair activities both in English language and EMI content-area subjects. In contrast, the lower-proficiency students received more explicit teaching of the linguistic forms/structures required in English examinations. The paper concludes by highlighting several critical issues concerning students' IC development in bilingual education, namely, the effects of English-medium education on students' speaking ability, implementation of TBLT, the influence of examinations on teaching practices, and teachers' role in promoting students' interactional competence through classroom interactions. Copyright ©2023 Wiley.