The goal of the Carnegie Mellon Online project is to build an infrastructure for delivery of courses via the World Wide Web. The project aims to deliver educational content and to assess student competency in support of courses across the Carnegie Mellon University (Pennsylvania) curriculum and beyond, thereby providing an asynchronous, student-centered approach to education. The system centers on a formal data model, supported by commercial database technology. This paper provides a technical overview of the system and its features, including system architecture, course and content model, pedagogical elements, database, interface, and technology base. The use of Carnegie Mellon Online in a large introductory computing competency course is discussed, as well as plans to use the system for other courses. Two figures present the Carnegie Mellon Online System Structure and the course model. (AEF)