Background: OSCE was conducted to measure the immediate outcome of ICM. The measurement focused on basic clinical skills. Methods: The subject of study was 115 third year medical students who took ICM course. The examination consisted of ten 5-minute stations with nine cases that represented commonly encountered problems in primary care. OSCE stations were duplicated into two sites. Therefore, same OSCE was performed six times in each sites. We evaluated the reliability of OSCE scores and compared the mean scores according to the examination sites and time sequences. Also, we got feedback from all participants by questionnaires. Results: Mean of total OSCE score was 52.1. Cronbach α of total station was 0.559. For blood pressure check, lung physical examination, and neck mass physical examination station, there was a significant difference in mean scores as the time sequences (p<0.05). Both students and examiners evaluated the OSCE positively, and felt that OSCE was meaningful experience to prepare clinical skills. Conclusion: We can confirm that OSCE is a reasonable evaluation tool for ICM. However, further trials to develop the more reliable and valid examinations will be warranted.