Keejun Han, Mun Y. Yi, Gahgene Gweon, Jae-Gil Lee. Understanding the Difficulty Factors for Learning Materials: A Qualitative Study. 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 615-618, Springer, 2013. [doi]
Abstract is missing.