This commentary aims to discuss an overarching boundary crossing framework under which integrated STEM (Science, Technology, Engineering, Mathematics) pedagogy can be conceptualized. Four potential learning dialogical processes for boundary crossing are presented and used as the main theoretical construct for the discussion. A proposal of an interactive pedagogical framework is put forward accompanied by a provisional statement to relate the connective factors that are critical in the formation of a boundary crossing STEM pedagogy. These factors are situated learning, communities of practices, problem solving, learning dialogical processes, and boundary objects. A Hong Kong school STEM case is employed to illustrate the applicability of this framework. The commentary ends with a reflective remark on boundary crossing STEM pedagogy. Copyright ©SpringerOpen.

This qualitative multi-case study explores a group of university-based language teacher educators' boundary crossing experiences in Hong Kong. Informed by a conceptual framework on boundary crossing and drawing on data from in-depth interviews and field observations, the findings reveal the opportunities and challenges embedded in teacher educators' boundary crossing between university and schools, between the teacher education and academic community, and between local and external contexts. The study contributes new knowledge to our understanding of teacher educators' boundary crossing through two different forms, i.e., horizontal and hierarchical, as they navigate sociocultural differences between various communities. The paper concludes with practical implications on how to promote teacher educators' continuing development in university settings. Copyright © 2020 Informa UK Limited, trading as Taylor & Francis Group.