Myroslava O. Dzikovska, Gwendolyn E. Campbell, Charles B. Callaway, Natalie B. Steinhauser, Elaine Farrow, Johanna D. Moore, Leslie A. Butler, Colin Matheson
Understanding answers to open-ended explanation questions is important in intelligent tutoring systems. Existing systems use natural language techniques in essay analysis, but revert to scripted interaction with short-answer questions during remediation, making adapting dialogue to individual students difficult. We describe a corpus study that shows that there is a relationship between the types of faulty answers and the remediation strategies that tutors use; that human tutors respond differently to different kinds of correct answers; and that re-stating correct answers is associated with improved learning. We describe a design for a diagnoser based on this study that supports remediation in open-ended questions and provides an analysis of natural language answers that enables adaptive generation of tutorial feedback for both correct and faulty answers.
Subjects: 1.3 Computer-Aided Education; 13. Natural Language Processing
Submitted: Feb 25, 2008