Purpose: Since 2002, Department of Surgery, Yonsei University Wonju College of Medicine attempted to revise the evaluation method of surgical clerkship program. The purpose of this study was to analyze the effect after change of evaluation method. Methods: Major changes in current revisions were summarized as follows; (1) multiple evaluator, (2) student s attitude evaluated by rating scale method, (3) attendance and procedure evaluation were measured in numbers according to the fixed criteria, (4) addition of clinic-based items such as problem-solving items in the final written examination. We compared the measurement of revised evaluation at 2002 with those at 1999. And the correlation or simple linear regression analysis between score of clerkship and student academic grade score were taken. Results: The clerkship score of students at 2002 showed more powerful discrimination between high performance group and poor group than that of 1999 s. Even though the subject score of clerkship was significantly correlated with grade score regardless of evaluation method of clerkship, the subject score of clerkship at 2002 was more closely correlated with a grade score than 1999 s. The score of knowledge-based items from final written examination is not correlated with clerkship score, but on the other hands, there was significant correlation between score of clinic-based items and clerkship score. Conclusion: In conclusion, variable measurements under the exact guideline and principle are more reliable method in evaluation of surgical clerkship.