Does Time Matter? Modeling the Effect of Time with Bayesian Knowledge Tracing. - Yumeng Qiu; Yingmei Qi; Hanyuan Lu; Zachary A. Pardos; Neil T. Heffernan (EDM, 2011)

Towards Data Driven Model Improvement. - Yumeng Qiu; Zachary A. Pardos; Neil T. Heffernan (FLAIRS, 2012)