The purpose of this study is to identify the key to the success in the clinical teaching method in pre-service teacher education. The author observed the internship program of teacher education department in the Michigan State University, which has been ranked the top for several years. The observation was conducted during November 2nd through 24th, 2005. The observation result indicates that the theoretical part of the educational theory is not only emphasized even in the practical internship, but also blended into the practice of intern, by emphasizing the construction of "if..., then..., because..." statement to the intern and by introducing the cutting-edge educational theories to the mentor teachers.