The purpose of this study was to explore the connection of the self-report test(1st Version) and the situational judgment test(2nd Version) to measure interpersonal relations competency. For this purpose, this study employed 25 college students in Jeju University and assessed their interpersonal relations competency by using the Korea Collegiate Essential Skills Assessment(K-CESA) system offered by Korea Research Institute for Vocational Education and Training(KRIVET). Also, 20 college students who showed a difference in the test scores of the self-report test and the situational judgment test were selected and the researcher administered semi-structured interview method. The main results of this study were as follows. First, there were statistically significant differences between the self-report test(1st Version) and the situational judgment test(2nd Version) in the understanding of organization, a component of interpersonal relations competency. Second, there were statistically significant differences between the understanding of organization of the first version and the emotional bond of the second version. Lastly, through the in-depth interview I searched for the oriented areas of the 1st and 2nd tests, and discussed the appropriateness of them.