Abstract
This article describes “lesson study” with utilizing the peer review system “FD Commons” in a Japanese university. The qualitative analysis of focus group interview in lesson study revealed the following three points : (1) professionals participating in this project expected that FDer advised her colleagues to improve their practices with her specific knowledge and skills of educational improvement, (2) the class images with reviewers’ comments, as feedback data from the system, were so impressive that lesson practitioners would be aware of severe teaching evaluation with no excuse, and (3) the new functions were needed to deal with class practitioners supportively and collaboratively by controlling and navigating review activities.