Experiences from Developing Educational Presentation Systems

This paper is a report about experiences and observations during the development of educational presentation systems for higher education. The paper discusses workflows during a typical slide-centric presentation. It presents different models that can be hierarchically aligned and extended by temporal information in order to reflect the workflows and to structure the content presented during a lecture. While structure and timing contribute to the high-level design of presentation systems the paper also identifies aspects that are relevant for mid- to low-level design and implementation of components within presentation systems. With respect to the comparison of related work, four key aspects are discussed. Finally, we present conclusions for the general design and development of flexible presentations systems.