The purpose of this article is to describe innovatory online teaching carried out in the inter-university master's "Educational Innovation Policies and Practices for the Knowledge Society", with the participation of Malaga, Almeria and Internacional de Andalucia Universities. The master's focuses on the exploration of a problem-based learning model, which was specifically developed and directed to reflect the basic assumptions of action research. The online teaching model, developed particularly by Internacional de Andalucia University, is the background for the development of an interdisciplinary core investigated in this study. The principles that sustain the problem-based learning model, particularly the full involvement of students in situated problems, have led to the application of action research's assumptions and premises by placing problems within the professional practice of the students, their reflections and their possible modifications. The results suggest that the interdisciplinary core is a collaborative innovative opportunity that can turn real innovation processes into study content, from the educational practice of students. (Contains 8 notes and 4 figures.)