Learning to tutor like a tutor: ranking questions in context

Authors:
Lee Becker;Martha Palmer;Sarel van Vuuren;Wayne Ward
Affiliations:
Center for Computational Language and Education Research, University of Colorado Boulder, Boulder, Colorado;Center for Computational Language and Education Research, University of Colorado Boulder, Boulder, Colorado;Center for Computational Language and Education Research, University of Colorado Boulder, Boulder, Colorado;Center for Computational Language and Education Research, University of Colorado Boulder, Boulder, Colorado, USA,Boulder Language Technologies, Boulder, CO
Venue:
ITS'12 Proceedings of the 11th international conference on Intelligent Tutoring Systems
Year:
2012

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Abstract

Asking questions in a context relevant manner is a critical behavior for intelligent tutoring systems; however even within a single pedagogy there may be numerous valid strategies. This paper explores the use of supervised ranking models to rank candidate questions in the context of tutorial dialogues. By training models on individual and aggregate judgments from experienced tutors, we learn to reproduce individual and average preferences in questioning. Analysis of our models' performance across different tutors highlights differences in individual teaching preferences and illustrates the impact of surface form, semantic and pragmatic features for modeling variations in tutoring styles. This work has implications for dialogue system design and provides a natural starting point towards creating tunable and customizable tutorial dialogue interactions.