Abstract
This study aimed to clarify the growth of the trainees based on how the PowerPoint slides used in the practice classes changed. Although there were changes in slides, many slides did not change, despite a definite improvement in teaching ability. It is necessary to clarify in the future what a “good class” is and how the improvement in teaching ability is specifically reflected in the slides. On the other hand, if the improvement of teaching ability is to be reflected in the change of slides, it was found that further guidance is needed, such as by intentionally making small changes.