This chapter presents the case of a global design and development project team in which the team leader has implemented two phases of action-research. During the teamwork, she implemented "reflection in action" that allowed to take a step back on situations and adapt the management of the team accordingly. Later, after the end of the project, a collaboration with an external researcher led to further theorization of the teamwork experience. This chapter first reviews the methodological literature to show that action research is an interesting method for international management research. Then, it presents two events that occurred during the project teamwork, and how action research was conducted in this context. Finally, recommendations are made to researchers who intend to implement action research in intercultural teams.