The work presented in this paper deals with the problem of converting university lectures into multimedia based digital learning material (learnware). The courses called Digital Interactive Lectures (DIALECT) require minimal interaction with the teacher and can be distributed over a broadband communication network. In order to increase the acceptance of DIALECT material a new model based on an integrated concept has been developed. It eliminates many of the weaknesses of traditional CBT courses and modern Open Distance Learning. Basically a “realistic story” that illustrates the theory to be presented and the accompanying case study (exercise) is developed and integrated into the lecture. This is accomplished with the help of interactive video which is used to present the topic, to guide through the parts of the lecture and to catch the students' attention.

DIALECT makes use of animation, computer simulation, and hyperlink facilities. The authors' interface is based on the notion of hyperlinked scripts and enables the inclusion of the appropriate media where needed. A corresponding framework for programmers that allows for easy and efficient use of multimedia-based presentation tools has been developed. Special attention has been paid to the user front-end in terms of screen design, interactivity and good video/audio quality.

The lectures are stored in compressed format on a UNIX server and can be presented on low-cost multimedia Windows PCs. Real time distribution over a digital network requires Quality of Service features because of the demand for constant bit transfer rate for the videos. DIALECT applications are well suited for ATM networks or high speed LANs.

First evaluation results show a high degree of acceptance. Will high quality multimedia lectures in some years compete with inferior-performing teachers?