“…This application of PVT offers new evidence that contributes to teacher educators' PCK, to the emerging literature on teacher educators' knowledge (Selmer et al, 2016) and to the wider debate on PCK, where there have been challenges of definition and measurement (Kind, 2009). It also extends the small body of existing PVT research that has examined BTs' knowledge of students' specific learning difficulties and conceptions of subject related phenomena (Kellner et al, 2011) or made reference to PCK in general (Nilsson, 2014). Finally, in providing evidence of the extent of BTs' conceptual change following their participation in a Learning Study, this study adds to the larger body of work examining the effectiveness of PVT in teacher development (Mun & Lo-Fu, 2013).…”