Data analysis involved two steps. First, and most importantly, the video-recorded
PCK test-lessons were analysed by both researchers individually with a sharp focus
on how the teachers enacted the specific content in the lesson and how their teaching
changed (or not) between the two lessons. Second, the transcribed tape recordings
were analysed through content analysis (applied in the way described by Miles &
Huberman, 1994) in order to identify changes in the teachers’ ways of reflecting on
their teaching. A content analysis of this kind is based on the view that it facilitates
the production of core constructs from textual data (e.g. a systematic method of
data reduction, data display, and conclusion drawing and verification).