In this paper we discuss a proposed user knowledge modeling architecture for the ICICLE system, a language tutoring application for deaf learners of written English. The model will represent the language pro ciency of the user and is designed to be referen

Heidi C. Dulay and Marina K. Burt. 1975. Natural sequences in child second language acquisition. Language Learning, 24(1). Rod Ellis. 1994. The Study of Second Language Acquisition. Oxford University Press, Oxford. David Ingram. 1989. First Language A

cquisition: Method, Description, and Explanation. Cambridge University Press, Cambridge and New York. Stephen Krashen. 1981. Second Language Acquisition and Second Language Learning. Pergamon Press, Oxford. Kathleen F. McCoy and Lisa N. Masterman (Michaud). 1997. A tutor for teaching English as a second language for deaf users of American Sign Language. In Proceedings of Natural Language Processing for Communication Aids, an ACL/EACL97 Workshop, pages 160{164, Madrid, Spain, July. Kathleen F. McCoy, Christopher A. Pennington, and Linda Z. Suri. 1996. English error correction: A syntactic user model based on principled mal-rule scoring. In Proceedings of the Fifth International Conference on User Modeling, pages 59{66, Kailua-Kona, Hawaii, January 2-5. UM96, User Modeling, Inc. Lisa N. Michaud and Kathleen F. McCoy. 1998. Planning text in a system for teaching English as a second language to deaf learners. In Proceedings of Integrating Arti cial Intelligence and Assistive Technology, an AAAI '98 Workshop, Madison, Wisconsin, July. Johanna D. Moore and Cecile L. Paris. 1992. Planning text for advisory dialogues: Capturing intentional and rhetorical information. Computational Linguistics, 19(4):651{695. J. Michael O'Malley and Anna Uhl Chamot. 1990. Learning Strategies in Second Language Acquisition. Cambridge University Press, Cambridge. Cecile Laurence Paris. 1987. The Use of Explicit User Models in Text Generation. Ph.D. thesis, Columbia University. Martin H. Ringle and Bertram C. Bruce. 1981. Conversation failure. In W. G. Lehnert and M. H. Ringle, editors, Knowledge Representation and Natural Language Processing, chapter 7, pages 203{221. Lawrence Erlbaum Associates, Hillsdale, New Jersey.

Robert Rueda. 1990. Assisted performance in writing instruction with learning-disabled students. In Luis C. Moll, editor, Vygotsky and Education: Instructional Implications and Applications of Sociohistorical Psychology, pages 403{426. CUP, Cambridge. David Schneider and Kathleen F. McCoy. 1998. Recognizing syntactic errors in the writing of second language learners. In Proceedings of the Thirty-Sixth Annual Meeting of the Association for Computational Linguistics and the Seventeenth International Conference on Computational Linguistics, volume 2, pages 1198{1204, Universite de Montreal, Montreal, Quebec, Canada, August 10-14. COLINGACL, Morgan Kaufmann Publishers. Bonnie D. Schwartz and Rex A. Sprouse. 1996. L2 cognitive states and the Full Transfer/Full Access model. Second Language Research, 12(1):40{72. Bonnie D. Schwartz. 1998. On two hypotheses of"transfer" in L2A: Minimal Trees and Absolute L1 In uence. In S. Flynn, G. Martohardjono, and W. O'Neil, editors, The Generative Study of Second Language Acquisition, chapter 3, pages 35{59. Lawrence Erlbaum, Mahwah, NJ. L. Selinker. 1972. Interlanguage. International Review of Applied Linguistics, 10:209{231. Linda Z. Suri and Kathleen F. McCoy. 1993. A methodology for developing an error taxonomy for a comp

uter assisted language learning tool for second language learners. Technical Report TR-93-16, Dept. of CIS, University of Delaware. Lev Semenovich Vygotsky. 1986. Thought and Language. MIT Press, Cambridge, MA. Wolfgang Wahlster and Alfred Kobsa. 1986. Dialog-based user models. In Giacomo Ferrari, editor, Proceedings of the IEEE, Special Issue on Natural Language Processing, February. Beverly P. Woolf. 1984. Context dependent planning in a machine tutor. Technical Report COINS Technical Report 84-21, Dept. of Computer and Information Science, University of Massachusetts at Amherst, May.