Video and coaching as vehicles for teachers’ professional development have both received much attention in educational research. The combination of the two, video coaching, where teachers watch and discuss videos of their own practice with a coach, seems especially promising, but there is limited insight into how the design leads to desired teacher and student outcomes through mediating enactment processes. This review systematically synthesized the occurrences and co-occurrences of video coaching design features, enactment processes, teacher outcomes, and student impacts as reported in 59 empirical studies. The literature corpus contained information on design features for all studies, but the video coaching enactment processes were described in only half of the studies. Altogether, the studies showed that video coaching can support some positive teacher outcomes, such as changes in pedagogical behavior, but evidence was not consistently reported for all types of outcomes. Few studies examined impacts on learners. Taken together, this review revealed important gaps in knowledge, which highlights the importance of paying attention to unpacking teacher learning processes.

The nature of knowledge and how it is developed have been debated in philosophy and research for centuries. In the literature on teachers' knowledge, two perspectives have been particularly visible. One perspective stresses cognitive processes and deliberate knowledge acquisition. Another perspective stresses the situated nature of teachers' learning and knowledge development through awareness. This theoretical article proposes that uniting both epistemological perspectives is beneficial for developing teachers' contextualized knowledge of how to teach at all phases of career development, and especially early on. In so doing, action and reflection are positioned as central to the development of teachers' knowledge, and affordances from both the deliberate and the aware perspectives are articulated. Specifically, this article explains why uniting the two perspectives supports better sense-making, more refined instructional planning, and more responsive teaching, before offering a united reflection model. These processes are then discussed in the context of video coaching interventions for early-career teachers. After presenting a blueprint for video-based reflection and key design features that could support teachers' learning, important differences compared to other reflection models are discussed and implications for (the design of) teachers' professional development based upon this united perspective are presented.

Video coaching can powerfully support teacher learning, but its implementation in face-to-face form presents substantial practical challenges. While mobile learning offers several potential solutions, we have limited insight into the design of mobile video coaching programs and especially into how specific technologies can attend to teacher learning needs during video coaching. Using conjecture mapping concepts, this theoretical article presents a generic model for video coaching, and proposes specific design features for mobile video coaching. After distinguishing between technologies that primarily facilitate access and technologies used as cognitive tools, attention is given to (their role in) the design of mobile video coaching in terms of the: activities and tasks planned; materials and resources used; and participation and practices envisioned. Following discussion of mobile video coaching in light of the situated, social, and distributed nature of teacher learning, the article concludes with implications for educational technology coordinators.

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Sara van der Lindenborn on the 16 th