We are interested in the observation of learner behavior in learning environments in order to compare it to a recommended learning scenario. This paper deals with visualization as a means for observation. Indeed, the visualization can bring different functionalities and we are particularly interested in two of them: first to make the visualization aid the user to better explain the learner's activities by highlighting relevant information; second, to manipulate data to add some semantics on them. We present some visualization techniques adapted to our purpose, based on results previously obtained in an experiment.
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France et al. (2005) studied this question.
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