Groupware: Design, Implementation, and Use 14th International Worksh

This book constitutes the refereed post-conference proceedings of the 14th International Workshop on Groupware: Design, Implementation, and Use, held in Omaha, Nebraska, USA, during September 14-18, 2008. The 30 papers presented were carefully reviewed an

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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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Robert O. Briggs Pedro Antunes Gert-Jan de Vreede Aaron S. Read (Eds.)

Groupware: Design, Implementation, and Use 14th International Workshop, CRIWG 2008 Omaha, NE, USA, September 14-18, 2008 Revised Selected Papers

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Volume Editors Robert O. Briggs Gert-Jan de Vreede Aaron S. Read University of Nebraska at Omaha, Omaha, NE 68135, USA E-mail: {rbriggs,gdevreede}@mail.unomaha.edu;[email protected] Pedro Antunes University of Lisbon, 1749–016 Lisbon, Portugal E-mail: [email protected]

Library of Congress Control Number: 2008942102 CR Subject Classification (1998): H.5.2, H.5.3, H.5, K.3.1, K.4.3, C.2.4 LNCS Sublibrary: SL 3 – Information Systems and Application, incl. Internet/Web and HCI ISSN ISBN-10 ISBN-13

0302-9743 3-540-92830-8 Springer Berlin Heidelberg New York 978-3-540-92830-0 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.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: 12592296 06/3180 543210

Preface

This volume presents the proceedings of the 14th International Workshop of Groupware (CRIWG 2008). The conference was held in Omaha, Nebraska, USA during September 14–18, 2008. Previous conferences were held in Argentina (Bariloche) in 2007, Spain (Medina del Campo) in 2006, Brazil (Porto de Galinhas) in 2005, Costa Rica (San Carlos) in 2004, France (Autrans) in 2003, Chile (La Serena) in 2002, Germany (Darmstadt) in 2001, Portugal (Madeira) in 2000, Mexico (Cancun) in 1999, Brazil (Buzios) in 1998, Spain (El Escorial) in 1997, Chile (Puerto