Ivon Arroyo Kimberly Ferguson Jeffrey Johns Toby Dragon Hasmik Meheranian Don Fisher Andrew G. Barto Sridhar Mahadevan Beverly Park Woolf Repairing Disengagement With Non-Invasive Interventions. 195-202 2007 AIED conf/aied/2007 db/conf/aied/aied2007.html#ArroyoFJDMFBMW07