KOSENs not only try to increase students’ engineering abilities and literacy, which is the ability to use knowledge and skills, but also their competency, which we consider is the ability to apply knowledge and skills to any problem that might arise outside the walls of school. So t he present study analyzes the relationship between a teacher’s evaluation of students’ self-assessment by “Daifuku-cho,” which is used for teacher -and-student interaction in PE class, and their competency improvement using PROG test scores. The result confirmed that students’ daily self -reflection and teachers’ feedback on them are important, and the outcome of their daily self -reflection can quantitatively show the growth in their competency. In particular, we report that the interaction between students and their teacher through the use of “Daifuku-cho” enhanced their learning and also that by comparing what the students wrote in “Daifuku- cho,” their grades and the results of PROG test, we suggest that the better students reflected themselves using “Daifuku-cho,” the more their competency developed.