Recently, as the practical training for clinical skills are extensively introduced in the curriculum of medical schools, the objective structured clinical examinations (OSCEs) is taken to assess the clinical skills of trainees. However, there have been very few papers mentioned about correlation between scores on a written examination of the clinical sciences and those on OSCE in Japan. In this study, to compare these of two kinds of examinations in year five medical students of Yamaguchi University, their scores of the stations of OSCE and those of the written examinations of clinical sciences which seemed to correlate stations of skill's examinations were studied statistically. As a result, there were no statistical significances in each scores between skill's evaluations and written tests. This results that these two examinations estimated the different abilities of students on the taxonomy of medical education. Moreover, OSCE is reconfirmed to be identical as an evaluative method of clinical skills. Now, new medical educational systems should be introducted for the training of skills and attitude for students.