Intelligent Tutoring Systems 9th International Conference, ITS 2008,

This book constitutes the refereed proceedings of the 9th International Conference on Intelligent Tutoring Systems, ITS 2008, held in Montreal, Canada, in June 2008. The 63 revised full papers and 61 poster papers presented together with abstracts of 5 ke

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Editorial Board David Hutchison Lancaster University, UK Takeo Kanade Carnegie Mellon University, Pittsburgh, PA, USA Josef Kittler University of Surrey, Guildford, UK Jon M. Kleinberg Cornell University, Ithaca, NY, USA Alfred Kobsa University of California, Irvine, CA, USA Friedemann Mattern ETH Zurich, Switzerland John C. Mitchell Stanford University, CA, USA Moni Naor Weizmann Institute of Science, Rehovot, Israel Oscar Nierstrasz University of Bern, Switzerland C. Pandu Rangan Indian Institute of Technology, Madras, India Bernhard Steffen University of Dortmund, Germany Madhu Sudan Massachusetts Institute of Technology, MA, USA Demetri Terzopoulos University of California, Los Angeles, CA, USA Doug Tygar University of California, Berkeley, CA, USA Gerhard Weikum Max-Planck Institute of Computer Science, Saarbruecken, Germany

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Beverley P. Woolf Esma Aïmeur Roger Nkambou Susanne Lajoie (Eds.)

Intelligent Tutoring Systems 9th International Conference, ITS 2008 Montreal, Canada, June 23–27, 2008 Proceedings

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Volume Editors Beverley P. Woolf University of Massachusetts, Amherst, MA 01003-4610, USA E-mail: [email protected] Esma Aïmeur Université de Montréal C.P. 6128, Succ. Centre-Ville Montréal QC, H3C 3J7, Canada E-mail: [email protected] Roger Nkambou University of Quebec at Montreal, Montreal, QC, H2X 3Y7, Canada E-mail: [email protected] Susanne Lajoie McGill University, Montreal, QC, H3A 1Y2, Canada E-mail: [email protected]

Library of Congress Control Number: 2008929517 CR Subject Classification (1998): K.3, I.2.6, H.5, J.1 LNCS Sublibrary: SL 2 – Programming and Software Engineering ISSN ISBN-10 ISBN-13

0302-9743 3-540-69130-8 Springer Berlin Heidelberg New York 978-3-540-69130-3 Springer Berlin Heidelberg New York

This work is subject to copyright. All rights are reserved, whether the whole or part of the material is concerned, specifically the rights of translation, reprinting, re-use of illustrations, recitation, broadcasting, reproduction on microfilms or in any other way, and storage in data banks. Duplication of this publication or parts thereof is permitted only under the provisions of the German Copyright Law of September 9, 1965, in its current version, and permission for use must always be obtained from Springer. Violations are liable to prosecution under the German Copyright Law. Springer is a part of Springer Science+Business Media springer.com © Springer-Verlag Berlin Heidelberg 2008 Printed in Germany Typesetting: Camera-ready by author, data conversion by Scientific Publishing Services, Chennai, India Printed on acid-free paper SPIN: 12282807 06/3180 543210

Preface

The 9th International Conference on Intelligent Tutoring Systems (ITS 2008) was held June 23–27, 2008 in Montreal. This year we celebrated the 20th anniversary of the conference founded in 1988 in Montreal. We have had biennial conferences for most of the past 10 years around the world, including in Brazil, Taiwan, France, Canada, and the USA. These ITS conferences provide a forum for the intercha