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This paper follows a method to effectively provide useful visualizations of learnerspsila behavior in e-learning. The results are some interactive visualization that should provide a much more proactive way of analysis, since it requires having to pay more attention for a complete understanding of the data and also, offers more data in the same time frame and space for the user (teacher). We present the analysis we have made to effectively provide the visualization tool that fitted us, the prefuse visualization toolkit to develop within our in-house e-learning tracking system called Merlin, which is sharable and fully open source. Finally, interactive visualization has helped us, teachers, to improve assessment of learning, and can probably help you too.