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Graesser, A. C., Olney, A. M., Haynes, B. C., & Chipman, P. (2005). AutoTutor: A cognitive system that simulates a tutor that facilitates learning through mixed-initiative dialogue. In C. Forsythe, M. L. Bernard, & T. E. Goldsmith (Eds.), Cognitive systems: Human cognitive models in systems design. Mahwah,NJ: Erlbaum.