Unterstützung des kooperativen Wissenserwerbs durch Hypervideo-Inhalte

This works covers the problem of supporting collaborative knowledge construction on the basis of hypervideo content. Thereby, hypervideo is defined as video based hypermedia that combines non-linear information structures with dynamic audio-visual information presentations. Video as the primary content type for hypervideo has become a media of increasing importance in past years. Thereby, videos can constitute an origin for communicating complex and dynamic visual information in an intuitive and effective fashion. This makes video an ideal content for knowledge construction within distributed environments. The concept of collaborative hypervideo enhanced the advantage of video in terms of group based discussion and/or conversation. With collaborative hypervideo group members can easily share their ideas and views with others and so establish a knowledge transfer among each other. This is achieved by the introduction of shared video annotations, in which users can accentuate objects out of the video context and combined these with further multimedia content or other video objects. In such a way a non-linear information structure will be created that can be easily applied for information access. The conceptual part of this work is based on an interaction model, a reference architecture and a data model for collaborative hypervideo. The model defines a user interface concept in terms of the hypervideo visualisation and interaction within a collaborative environment. The reference architecture provides a logical view of an abstract system. This architecture contributes to concrete system realisations within different application areas. The data model defines a core concept of how elements of a collaborative hypervideo structure like nodes, links, anchors and metadata sets, are organized in an effective manner. The general concept of collaborative hypervideo has been validated by means of four empirical field studies. The results gave great evidence for the conceptual work fulfilled and proofed that with collaborative hypervideo the construction of knowledge within a group based scenario is achieved.