This paper describes the authors' experiences in developing an all-in-one virtual university. The Defense Acquisition University (DAU) is a consortium of Department of Defense education and training institutions and organizations that provides mandatory and assignment-specific courses for military and civilian personnel serving in 11 acquisition career fields. The DAU virtual campus is a unique model for World Wide Web-based instruction because it integrates all aspects of managing a corporate university while providing myriad dynamic layers of access privileges. The Operational Support System (OSS) provides functionality in 16 main areas, i.e., DAU public Web site, registration, enrollment, login, OSS user types, OSS collaboration tools, search, history, logs, reports, canned e-mail, feedback, help, courseware interfaces, test application, and database interfaces. The first section of the paper discusses why DAU is transitioning to the OSS. The second section summarizes the purpose of the OSS, including the following components: student registration, course enrollment, test delivery, course evaluation, student tracking, report generation, problem resolution, and site collaboration. The third section describes DAU's approach to developing courseware, including considerations related to learner interactions, testing and evaluation, and student-faculty interactions. The third section addresses defining the course structure, including test questions, deciding which OSS tools to integrate, and populating OSS tools. (MES)