The use of video recordings as a data source in qualitative research presents challenges when it comes to selecting time scales. Here, we discuss the implications of selecting time scales with regard to the interpretations and conclusions of a classroom event. The analysis draws on data from the PISA+ project, a large-scale video study of six…

Identifying and describing teaching practice is not an easy task. Current educational research aims at explaining teachers' work focusing on the concept of practice. Teachers' practical knowledge is a sensitive and tacit knowledge, produced, and effused by the body. In this perspective, the teachers' work can be considered as an expressive…

Until recently, much of the research on students' understanding of statistical ideas has focused on their conceptions of center or on what constitutes a good sample. In the past decade research on students' statistical thinking has broadened and increasing interest has been paid to how students think about variability in data or variability in…