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Graesser, A. C., Jackson, G. T., Mathews, E. C., Mitchell, H. H., Olney, A., Ventura, M., Chipman, P., Franceschetti, D., Hu, X., Louwerse, M. M., Person, N. K., & TRG (2003a). Why/AutoTutor: A test of learning gains from a physics tutor with natural language dialog. In R. Alterman, & D. Hirsh (Eds.), Proceedings of the 25rd Annual Conference of the Cognitive Science Society (pp. 1–5). Boston, MA: Cognitive Science Society.