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Web-based learning environments such as the Go-Lab portal facilitate the structuring and scaffolding of inquiry processes and enable learners to create various types of knowledge artefacts (texts, concept maps, hypotheses). In this context, we have introduced semantic technologies to extract key concepts from heterogeneous learner-generated artefacts. Based on this approach, we propose an algorithm...
Problem-based learning (PBL) can be organized and conducted in a number of ways. Building a PBL application to support various PBL forms directly is difficult because the scope of variability cannot be completely known and there is a high cost in terms of time and efforts incurred. Existing PBL applications are developed usually to support a specific form of PBL. In this paper we propose a model-driven...
Free-hand drawing of diagrams or sketches is a natural form of expression in a variety of learning settings. It is easily supported by tablets or tablet PCs. Often such sketches are the basis of reasoning processes, also in collaborative scenarios. Sketches can indicate misconceptions. Therefore it is desirable to support a semantic interpretation of sketches integrated with other parts of a learning...
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