Karen L. Myers, Melinda T. Gervasio, Christian Jones, Kyle McIntyre, Kellie Keifer. Drill Evaluation for Training Procedural Skills. In H. Chad Lane, Kalina Yacef, Jack Mostow, Philip I. Pavlik, editors, Artificial Intelligence in Education - 16th International Conference, AIED 2013, Memphis, TN, USA, July 9-13, 2013. Proceedings. Volume 7926 of Lecture Notes in Computer Science, pages 561-570, Springer, 2013. [doi]