Existing studies have measured the effect of video-based feedback on student performance or satisfaction. Other issues are underacknowledged or merit further investigation. These include sociocultural aspects which may shape the design and implementation of video-based feedback, the ways students use technology to engage in feedback, and the processes through technology may transform learning. This study investigates the design and implementation of a video-annotated peer feedback activity to develop students' presentation skills and knowledge of climate science. It explores how their use of a video annotation tool re-mediated established feedback practices and how the systematic analysis of contradictions in emerging practices informed the subsequent redesign and reimplementation of the approach. Employing a formative intervention design, the researchers intervened in the activity system of a first-year undergraduate education module to facilitate two cycles of expansive learning with an instructor and two groups of Hong Kong Chinese students (n = 97, n = 94) across two semesters. Instructor interviews, student surveys, and video annotation and system data were analysed using Activity Theory-derived criteria to highlight contradictions in each system and suggest how these could be overcome. The findings highlight the critical importance of active instructor facilitation; building student motivation by embedding social-affective support and positioning peer feedback as an integrated, formative process; and supporting students' use of appropriate cognitive scaffolding to encourage their interactive, efficient use of the annotation tool. Conclusions: In a field dominated by experimental and quasi-experimental studies, this study reveals how an Activity Theory-derived research design and framework can be used to systemically analyse cycles of design and implementation of video-annotated peer feedback. It also suggests how the new activity system might be consolidated and

Young children are naturally curious about sexuality. It is thus imperative to implement sexuality education as early as in kindergarten. Currently, little is known about pre-service kindergarten teachers’ attitudes towards sexuality education. This study fills in the research gap by investigating Hong Kong pre-service kindergarten teachers’ approach to handling children’s sexuality-related behaviours and its correlates. Two hundred and forty-five students were recruited from a local pre-service kindergarten teacher training programme to complete a questionnaire. Descriptive statistics suggested that some pre-service teachers were unlikely to use an accepting and open discussion approach to handle children’s sexuality-related behaviours. Repeated measures analysis further revealed that pre-service teachers tended to use an accepting and open discussion approach when children displayed gender-typed play behaviours and showed curiosity towards pregnancy and birth. The prohibitive and punitive approach was more likely to be adopted when children showed curiosity towards sexual behaviours. Bivariate correlation analysis showed that the inclination to use an accepting and open discussion approach was positively correlated with the perceived levels of benefits of early childhood sexuality education and parents’ trust towards teachers and negatively associated with shame of talking about sexuality. Results of structural equation modelling, however, showed that the perceived level of benefits of early childhood sexuality education was the only significant correlate. These findings point to the importance of promoting pre-service teachers’ awareness of the values of early childhood sexuality education and strengthening pre-service teachers’ skills in handling young children’s sexuality-related behaviours (especially their curiosity about sexual behaviours) in teacher education programmes. Copyright © 2018 HKERA International Conference.