This paper gives an overview of MediBook, a joint project of the Medical Department of the University GieBen (Germany) and the Department of Electrical Engineering and Information Technology at Darmstadt University of Technology (Germany) funded by the Hessian Ministry for Science and Arts (HMWK). The basis of MediBook is a formal representation of the medical domain. The formal representation consists of the important medical concepts that are associated with each other by semantic relationships. In MediBook, three roles are supported: author, teacher, and learner. The goal of the project is the enhancement of education in medical schools by means of a flexible system, and currently learners in the context of MediBook are students of medical schools; however, the system can easily be used for advanced education of physicians or as an information system. The flexibility of the system aims at self-studying, independently from space and time. MediBook is a system that provides tools for storing, managing, and especially locating and combining learning resources. It offers means for both describing single sources (thereby putting them into a context) and combining single resources to courses. Thus MediBook represents a knowledge base with efficient access and tools to generate arbitrary coherent courses from single information units. (Contains 14 references.) (AEF)