{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,10]],"date-time":"2026-04-10T10:02:36Z","timestamp":1775815356515,"version":"3.50.1"},"publisher-location":"Berlin, Heidelberg","reference-count":12,"publisher":"Springer Berlin Heidelberg","isbn-type":[{"value":"9783642223617","type":"print"},{"value":"9783642223624","type":"electronic"}],"license":[{"start":{"date-parts":[[2011,1,1]],"date-time":"2011-01-01T00:00:00Z","timestamp":1293840000000},"content-version":"unspecified","delay-in-days":0,"URL":"http:\/\/www.springer.com\/tdm"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2011]]},"DOI":"10.1007\/978-3-642-22362-4_21","type":"book-chapter","created":{"date-parts":[[2011,6,27]],"date-time":"2011-06-27T20:06:40Z","timestamp":1309205200000},"page":"243-254","source":"Crossref","is-referenced-by-count":138,"title":["KT-IDEM: Introducing Item Difficulty to the Knowledge Tracing Model"],"prefix":"10.1007","author":[{"given":"Zachary A.","family":"Pardos","sequence":"first","affiliation":[]},{"given":"Neil T.","family":"Heffernan","sequence":"additional","affiliation":[]}],"member":"297","reference":[{"key":"21_CR1","series-title":"Lecture Notes in Computer Science","doi-asserted-by":"publisher","first-page":"473","DOI":"10.1007\/11774303_47","volume-title":"Intelligent Tutoring Systems","author":"J. Johns","year":"2006","unstructured":"Johns, J., Mahadevan, S., Park Woolf, B.: Estimating Student Proficiency Using an Item Response Theory Model. In: Ikeda, M., Ashley, K., Cahn, T.-W. (eds.) ITS 2006. LNCS, vol.\u00a04053, pp. 473\u2013480. Springer, Heidelberg (2006)"},{"key":"21_CR2","first-page":"61","volume-title":"The Cambridge Handbook of the Learning Sciences","author":"K.R. Koedinger","year":"2006","unstructured":"Koedinger, K.R., Corbett, A.T.: Cognitive tutors: Technology bringing learning science to the classroom. In: Sawyer, K. (ed.) The Cambridge Handbook of the Learning Sciences, pp. 61\u201378. Cambridge University Press, New York (2006)"},{"key":"21_CR3","doi-asserted-by":"publisher","first-page":"253","DOI":"10.1007\/BF01099821","volume":"4","author":"A.T. Corbett","year":"1995","unstructured":"Corbett, A.T., Anderson, J.R.: Knowledge Tracing: Modeling the Acquisition of Procedural Knowledge. User Modeling and User-Adapted Interaction\u00a04, 253\u2013278 (1995)","journal-title":"User Modeling and User-Adapted Interaction"},{"key":"21_CR4","series-title":"Lecture Notes in Computer Science","doi-asserted-by":"publisher","first-page":"406","DOI":"10.1007\/978-3-540-69132-7_44","volume-title":"Intelligent Tutoring Systems","author":"R.S.J.d. Baker","year":"2008","unstructured":"Baker, R.S.J.d., Corbett, A.T., Aleven, V.: More accurate student modeling through contextual estimation of slip and guess probabilities in bayesian knowledge tracing. In: Woolf, B.P., A\u00efmeur, E., Nkambou, R., Lajoie, S. (eds.) ITS 2008. LNCS, vol.\u00a05091, pp. 406\u2013415. Springer, Heidelberg (2008)"},{"key":"21_CR5","series-title":"Lecture Notes in Computer Science","doi-asserted-by":"publisher","first-page":"52","DOI":"10.1007\/978-3-642-13470-8_7","volume-title":"User Modeling, Adaptation, and Personalization","author":"R.S.J.d. Baker","year":"2010","unstructured":"Baker, R.S.J.d., Corbett, A.T., Gowda, S.M., Wagner, A.Z., MacLaren, B.A., Kauffman, L.R., Mitchell, A.P., Giguere, S.: Contextual Slip and Prediction of Student Performance after Use of an Intelligent Tutor. In: De Bra, P., Kobsa, A., Chin, D. (eds.) UMAP 2010. LNCS, vol.\u00a06075, pp. 52\u201363. Springer, Heidelberg (2010)"},{"key":"21_CR6","series-title":"Lecture Notes in Computer Science","doi-asserted-by":"publisher","first-page":"255","DOI":"10.1007\/978-3-642-13470-8_24","volume-title":"User Modeling, Adaptation, and Personalization","author":"Z.A. Pardos","year":"2010","unstructured":"Pardos, Z.A., Heffernan, N.T.: Modeling Individualization in a Bayesian Networks Implementation of Knowledge Tracing. In: De Bra, P., Kobsa, A., Chin, D. (eds.) UMAP 2010. LNCS, vol.\u00a06075, pp. 255\u2013266. Springer, Heidelberg (2010)"},{"key":"21_CR7","doi-asserted-by":"crossref","unstructured":"Pardos, Z., Dailey, M., Heffernan, N.: Learning what works in ITS from non-traditional randomized controlled trial data. The International Journal of Artificial Intelligence in Education (in Press, 2011)","DOI":"10.1007\/978-3-642-13437-1_5"},{"key":"21_CR8","first-page":"555","volume-title":"Proceedings of the 12th Artificial Intelligence in Education","author":"L. Razzaq","year":"2005","unstructured":"Razzaq, L., Feng, M., Nuzzo-Jones, G., Heffernan, N.T., Koedinger, K.R., Junker, B., et al.: The Assistment project: Blending assessment and assisting. In: Looi, C.K., McCalla, G., Bredeweg, B., Breuker, J. (eds.) Proceedings of the 12th Artificial Intelligence in Education, pp. 555\u2013562. ISO Press, Amsterdam (2005)"},{"key":"21_CR9","series-title":"Lecture Notes in Artificial Intelligence","doi-asserted-by":"publisher","first-page":"137","DOI":"10.1007\/3-540-44566-8_14","volume-title":"User Modeling 2001","author":"A.T. Corbett","year":"2001","unstructured":"Corbett, A.T.: Cognitive computer tutors: Solving the two- sigma problem. In: Bauer, M., Gmytrasiewicz, P.J., Vassileva, J. (eds.) UM 2001. LNCS (LNAI), vol.\u00a02109, pp. 137\u2013147. Springer, Heidelberg (2001)"},{"key":"21_CR10","unstructured":"Pardos, Z.A., Heffernan, N.T.: Using HMMs and bagged decision trees to leverage rich features of user and skill from an intelligent tutoring system dataset. To appear in Journal of Machine Learning Research W & CP (in Press)"},{"key":"21_CR11","doi-asserted-by":"publisher","first-page":"75","DOI":"10.1145\/1345448.1345465","volume":"9","author":"R. Bell","year":"2007","unstructured":"Bell, R., Koren, Y.: Lessons from the Netflix Prize Challenge. SIGKDD Explorations\u00a09, 75\u201379 (2007)","journal-title":"SIGKDD Explorations"},{"key":"21_CR12","unstructured":"Yu, H.-F., Lo, H.-Y., Hsieh, H.-P., Lou, J.-K., McKenzie, T.G., Chou, J.-W., et al.: Feature Engineering and Classifier Ensemble for KDD Cup 2010. In: Proceedings of the KDD Cup 2010 Workshop, pp. 1\u201316 (2010)"}],"container-title":["Lecture Notes in Computer Science","User Modeling, Adaption and Personalization"],"original-title":[],"link":[{"URL":"http:\/\/link.springer.com\/content\/pdf\/10.1007\/978-3-642-22362-4_21","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2019,6,12]],"date-time":"2019-06-12T08:15:11Z","timestamp":1560327311000},"score":1,"resource":{"primary":{"URL":"http:\/\/link.springer.com\/10.1007\/978-3-642-22362-4_21"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2011]]},"ISBN":["9783642223617","9783642223624"],"references-count":12,"URL":"https:\/\/doi.org\/10.1007\/978-3-642-22362-4_21","relation":{},"ISSN":["0302-9743","1611-3349"],"issn-type":[{"value":"0302-9743","type":"print"},{"value":"1611-3349","type":"electronic"}],"subject":[],"published":{"date-parts":[[2011]]}}}