Preface LWA 2015 is a joint conference of four special interest groups of the German Com- puter Science Society (GI), addressing research in the areas of knowledge discovery and machine learning, information retrieval, database systems, and knowledge man- agement. The German acronym LWA stands for “Lernen, Wissen, Adaption” (Learn- ing, Knowledge, Adaptation). Following the tradition of the last years, LWA 2015 provides a joint forum for experienced and young researchers, to bring insights to recent trends, technologies and applications and to promote interaction among the special interest groups. The following special interest groups participate at LWA 2015: • KDML (Knowledge Discovery, Data Mining and Machine Learning) • FGWM (Knowledge Management) • IR (Information Retrieval) • FGDB (Database Systems) The papers have been selected by independent program committees from the respec- tive domains. The program consists of several joint sessions which include contributions of inter- est for all conference participants. In addition, there are parallel sessions for individu- al workshops focussing on more specific topics. A poster session gives all presenters the opportunity to discuss their work in a broader context. Recent trends in the corre- sponding research areas are highlighted by four distinguished keynote speakers: • Steffen Staab, University of Koblenz-Landau • Thomas Seidl, RWTH Aachen • Norbert Ritter, University of Hamburg • Andreas Henrich, University of Bamberg The accompanying social programme includes a guided city tour in the city centre of Trier followed by a conference dinner in the “Bitburger Wirtshaus”. The organizers would like to thank the workshop chairs and their programme com- mittees for their excellent work as well as the keynote speakers for their contribution to the success of LWA 2015. Finally, we gratefully acknowledge the generous sup- port of our sponsors, in particular EMPOLIS, IBM, and SER. We hope that LWA 2015 will be an inspiring event for all participants with lots of scientific exchange and discussions. September 2015 Ralph Bergmann Sebastian Görg Gilbert Müller (Editors, LWA'15) 1 Organization LWA 2015 is hosted and organized by the research group “Business Information Systems II” at the University of Trier. LWA 2015 General Organization Ralph Bergmann, University of Trier (General Chair) Maria Gindorf, University of Trier (Conference Secretary) Gilbert Müller, University of Trier Sebastian Görg, University of Trier KDML 2015 Workshop Organization Robert Jäschke, Leibniz Universität Hannover Emmanuel Müller, Hasso Plattner Institut FGWM 2015 Workshop Organization Michael Leyer, University of Rostock Christian Sauer, University of West London IR 2015 Workshop Organization Claus-Peter Klas, GESIS – Leibniz Institute for the Social Sciences Ingo Frommholz, University of Bedfordshire FGDB 2015 Workshop Organization Thomas Ruf, Universität Erlangen-Nürnberg Alfons Kemper, TU München KDML 2015 Programme Committee Martin Atzmueller University of Kassel Christian Bauckhage Fraunhofer IAIS Martin Becker University of Würzburg Daniel Bengs German Institute for International Educational Research Alexander Dallmann University of Würzburg Ernesto Diaz-Aviles IBM Research Stephan Doerfel University of Kassel Wouter Duivesteijn TU Dortmund Stephan Günnemann Carnegie Mellon University Matthias Hagen Bauhaus University Weimar 2 Marwan Hassani RWTH Aachen University Alexander Hinneburg Martin-Luther-University Halle-Wittenberg Andreas Hotho University of Würzburg Frederik Janssen TU Darmstadt Robert Jäschke Leibniz Universität Hannover Kristian Kersting TU Dortmund University Marius Kloft TU Berlin Ralf Krestel Hasso Plattner Institute Florian Lemmerich University of Würzburg Ulf Leser Humboldt-Universität zu Berlin Eneldo Loza Mencía TU Darmstadt Hannes Mühleisen Centrum Wiskunde & Informatica (CWI) Emmanuel Müller Hasso Plattner Institut Thomas Niebler University of Würzburg Nico Piatkowski TU Dortmund University Achim Rettinger Karlsruhe Institute of Technology Elena Sapozhnikova University of Konstanz Ansgar Scherp Leibniz Information Center for Economics (ZBW) Ute Schmid University of Bamberg Erich Schubert Ludwig-Maximilians-Universität München Robin Senge University of Marburg Arthur Zimek Ludwig-Maximilians-Universität München FGWM 2015 Programme Committee Klaus-Dieter Althoff DFKI / University of Hildesheim Kerstin Bach Norwegian University of Science and Technology Joachim Baumeister denkbares GmbH Axel Benjamins Universität Osnabrück Mareike Dornhöfer Universität Siegen Susanne Durst University of Skövde Michael Fellmann University of Rostock Dimitris Karagiannis University of Vienna Andrea Kohlhase University of Applied Sciences Neu-Ulm Michael Leyer University of Rostock Ronald Maier University of Innsbruck Alke Martens University of Rostock Mirjam Minor Goethe University Frankfurt Miltos Petridis Brighton University Ulrich Reimer University of Applied Sciences St. Gallen Jochen Reutelshöfer denkbares GmbH Bodo Rieger Universität Osnabrück Peter Rossbach Frankfurt School of Finance & Management Thomas Roth-Berghofer University of West London Kurt Sandkuhl University of Rostock 3 Christian Sauer University of West London Sahar Vahdati University of Bonn IR 2015 Programme Committee Reginald Ferber Hochschule Darmstadt Ingo Frommholz University of Bedfordshire Joachim Griesbaum University of Hildesheim Andreas Henrich University of Bamberg Daniel Hienert GESIS – Leibniz Institute for the Social Sciences Frank Hopfgartner University of Glasgow Claus-Peter Klas GESIS – Leibniz Institute for the Social Sciences Udo Kruschwitz University of Essex Johannes Leveling Elsevier Thomas Mandl University of Hildesheim Philipp Mayr GESIS – Leibniz Institute for the Social Sciences Peter Mutschke GESIS – Leibniz Institute for the Social Sciences Henning Müller HES-SO Ralf Schenkel University of Passau Christian Wolff University of Regensburg David Zellhoefer Berlin State Library FGDB 2015 Programme Committee Tilo Balke TU Braunschweig Silke Eckstein TU Braunschweig Vera Kamp PLATH GmbH Alfons Kemper TU München Richard Lenz University of Erlangen Daniela Nicklas University of Bamberg Thomas Ruf Universität Erlangen-Nürnberg Knut Stolze IBM Germany 4