The individual cases indicate how the teachers actively changed their teaching of the
specific content in a way that provided new possibilities for students to grasp the object
of learning. The four teachers in the project expressed changes concerned with both
the ways in which they managed to identify the object for learning and their approaches
to teaching this specific content and the underpinning reasons for that approach (i.e.
the special amalgam of content knowledge and knowledge of general pedagogy that is
the foundation of PCK). 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. In this discussion we will briefly discuss three overarching
and inter-related themes and their relations to earlier research on teachers’
PCK.