Editorial for the Second Special Issue on “Conceptualizing and Using Theory in Computing Education Research”

In this editorial, we introduce the second set of papers for the special issue “Conceptualizing and Using Theory in CER”. These papers focus on meta level discussion on theories in CER, addressing the definition of theories, what theoretical contributions have been developed for CER, how theories have been used, and what other type of contributions there are in the field. The issue also includes guest editors’ own reflections on theory.