action research

[Abstract] Lesson improvement is becoming essential for adapting to the recent rapid changes in education. “Action research” is treated as a way to improve lessons. This paper reviews collaborative action research (CAR) to identify group decision-making for lesson improvement, providing methodologies based on the analytic hierarchy process, which is known as a method for successful group decision-making. In this study, we performed simulations to incorporate the analytic hierarchy process with CAR in the process of lesson improvement. Moreover, this work reviews how people from different fields discuss CAR and how diverse opinions are integrated into the process of revising plans. The difficulties of discussing in a group are also examined, focusing on the concept of groupthink.