Medical interviewing skills were assessed with the objective structured clinical examination using simulated/standardized patients (SP) in 36 5th-year medical students. ultaneously, assessment of cognitive-behavioral characteristics was performed using 7 kinds of scales (locus of control, social skills, self-esteem, general self-efficacy, medical interviewing-specific self-efficacy, person perception of self, and person perception of the patient) on the same students to clarify correlations with medical interviewing skills. Students who had attended a small-group mini-workshop session for medical interviewing skills showed only a significantly better ability to summarize. Personal familiarity with the patient was the only factor among the cognitive-behavioral factors studied which was a significantly correlated with medical interviewing skills. Among the six medical interviewing skills, only summarization and confirmation skills were positively correlated with the students' self-efficacy and the objective assessment with the objective structured clinical examination. We conclude that 1) medical interviewing skills can be taught regardless of the cognitive-behavioral abilities of each student; 2) teaching summarization and confirmation skills are especially valuable and important in teaching medical interviewing to medical students.