Efforts to promote disciplinary literacy can help students integrate knowledge with ways of doing and being within disciplinary settings. Yet, effectively facilitating disciplinary literacy, even within an upper-level undergraduate physics course like the one studied here, is surprisingly hard. This article qualitatively analyzes an instructor's…

The Hertzsprung-Russell diagram (HRD) is a fundamental representation in stellar physics. It contains information about key properties of stars and allows inferences about stellar evolution. The use of the HRD is an important disciplinary activity in astrophysics. For example, it is particularly important to have a graphical understanding of the…

The topic of "teacher professionalism" is one of the most crucial ones in quality education research. It has a potential to generate results that could inform and hence enhance the practice in classrooms. Thus, research in this field needs reliable instruments to measure the professional knowledge of our teachers to be able to generate…