Fading and Deepening: The Next Steps for Andes and other Model-Tracing Tutors.

Kurt VanLehn, Reva Freedman, Pamela W. Jordan, R. Charles Murray, Remus Osan, Michael A. Ringenberg, Carolyn P. Ros, Kay G. Schulze, Robert Shelby, Donald Treacy, Anders Weinstein, Mary Wintersgill

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