One way for teachers to develop their professional knowledge, which also focuses on specific science
content and the ways students learn, is through being involved in researching their own practice.
The aim of this study was to examine how science teachers changed (or not) their professional
knowledge of teaching after inquiring into their own teaching in learning studies. The data used in
this article consisted of interviews and video-recorded lessons from the six teachers before the project
(PCK pre-test) and after the project (PCK post-test), allowing an analysis of if and if then how the
teachers changed their teaching practice. Hence, this study responds to the urgent call to focus direct
attention on the practice of science teaching. When looking at the individual teachers, it was possible
to discern similarities in the ways they have changed their teaching in lesson 2 compared to lesson 1,
changes that can be described as: changes in how the object of learning was defined and focused,
changes in how the examples that were presented to the students were chosen and changes in how
the lessons were structured which in turn influenced the meaning of the concepts that were dealt
with. As such, issues for enhancing teachers’ professional learning were unpacked in ways that began
to demonstrate, and offer insights into, the extent of their PCK development over time.