The purpose of the present study is to examine the relationship among class participation, attitudes and scores on formative assessment, and academic achievement To answer these question, a survey instrument was provided to 151 respondents who had taken ‘Modern Psychology’ in the second semester of 2017. To compare the effectiveness of formative assessment, students in 4 classes participated in the study, all enrolled in Hanbat National University's Modern psychology course in the first semester of 2017 and second semester of 2016. The results of the study are as follows. First, students have more negative attitude than positive attitude in formative assessment. Second, the higher the class participation, the more the positive attitude toward formative assessment and the more the formative assessment score. Third, the higher the positive attitude toward formative assessment, the lower the formative assessment score in the mid-level academic achievement group. Fourth, the scores of the groups(2017) that performed the formative assessment were higher than those of the groups(2016) that did not.