The rapid developments in both the availability and the acceptance of Internet as an ordinary tool for everyday life have made the Web an important resource necessary for education. College students today in Korea are generally comfortable with using and learning of new technologies. The widespread internet access throughout Korea has also made it easy for most students to have a stable, high speed internet connection from anywhere in Korea. Clearly, It is the right time for educators to take full advantage of the current state of technology and apply it to education for maximum benefit. In this study, a Web-based learning system available for all instructors at A University A called the Cyber Campus A, is described for its ease setup and use. While using Web-based learning system provides flexibility for both students and teachers in today's fast paced society, it does not guarantee that effective learning can take place. In fact, the effectiveness of Web-based learning may be more dependent on the individual teacher than traditional classroom teaching. In order to better understand the difference between effective and less effective Web based teaching, two instructors with opposite experiences in Web-based teaching and learning are described and analyzed. The principles of pedagogy and administrative factors that influenced the two very different experiences of Web-based instructors are compared to point out the important factors that need to be considered for the new instruction medium. The Web-based instruction has deminstrated the potential to be a truly flexible and an effective teaching medium. Nevertheless, extra effort ofteacher in both preparing and executing the instruction may be an obstacle for most teachers.