Every year since 2001 each series of lectures at the Sapporo Medical University School of Medicine has been evaluated using 10 questions with classification into five grades. In this study, the evaluation scores for 2001 and 2002 were compared and analyzed statistically. The average score for all subjects increased by 0.15 point in 2002. The average scores for liberal arts and clinical medicine increased 0.18 and 0.27 point, respectively, whereas the score for basic medicine increased 0.03 point, suggesting improvements with the efforts of each lecturer. The standard deviations of the scores for 8 questions (2 questions on examinations were omitted) were smaller for clinical medicine than for liberal arts and basic medicine. Continuous formative evaluation of each series of lectures and analysis of the results are needed to improve teaching skills.