This research focuses on developing MCRS(Mobile Classroom Response System) using smartphone and
Cloud system, and we analyzed the learner’s recognition on it and how personal traits affects learner's class
satisfaction. After the study, learners overall gave positive feedback on MCRS and replied that it was easy
to use. Furthermore, though there was no significant difference by gender and grade, extraversion factor of
the Big Five personality trait showed positive correlation (r=.344) with the recognition on class
participation. Through this research, we saw that MCRS can be a good substitute to the existing CRS and
we suggested that in order to achieve the original purpose of CRS, MCRS must find a suitable method
according to different learners' features