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The evaluation process is key for educator's acceptance of any educational action. The evaluation is challenging in most cases but especially when educational games are used. In educational games if in-game evaluation exist it is usually based on a series of simple goals and whether these goals are achieved (i.e. assessment). But we consider that evaluation can be improved by taking advantage of in-game interaction, such as the user behavior during the game and the type and number of interactions performed by the user while playing. In this paper, we propose an evaluation framework for educational games based on in-game interaction data. We discuss how user interaction data is collected in the most automatic and seamless way possible, how to analyze the data to extract relevant information, and how to present this information in a usable way to educators so they achieve the maximum benefit from the experience. The evaluation framework is implemented as part of the eAdventure educational platform, where it can be used both to improve upon traditional basic assessment methods (i.e. goals, scores & reports) and to provide information to help improve interaction with games (e.g. discovery strategies).