Fading and Deepening: The Next Steps for Andes and other Model-Tracing Tutors.
Kurt VanLehnReva FreedmanPamela W. JordanR. Charles MurrayRemus OsanMichael A. RingenbergCarolyn Penstein RoséKay G. SchulzeRobert ShelbyDonald TreacyAnders WeinsteinMary WintersgillPublished in: Intelligent Tutoring Systems (2000)