Lecture Notes in Computer Science 6470

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1 Lecture Notes in Computer Science 6470 Commenced Publication in 1973 Founding and Former Series Editors: Gerhard Goos, Juris Hartmanis, and Jan van Leeuwen Editorial Board David Hutchison, UK Josef Kittler, UK Alfred Kobsa, USA John C. Mitchell, USA Oscar Nierstrasz, Switzerland Bernhard Steffen, Germany Demetri Terzopoulos, USA Gerhard Weikum, Germany Takeo Kanade, USA Jon M. Kleinberg, USA Friedemann Mattern, Switzerland Moni Naor, Israel C. Pandu Rangan, India Madhu Sudan, USA Doug Tygar, USA Services Science Subline of Lectures Notes in Computer Science Subline Editors-in-Chief Robert J.T. Morris, IBM Research, USA Michael P. Papazoglou, University of Tilburg, The Netherlands Darrell Williamson, CSIRO, Sydney, Australia Subline Editorial Board Boualem Bentallah, Australia Athman Bouguettaya, Australia Murthy Devarakonda, USA Carlo Ghezzi, Italy Chi-Hung Chi, China Hani Jamjoom, USA Paul Klingt, The Netherlands Ingolf Krueger, USA Paul Maglio, USA Christos Nikolaou, Greece Klaus Pohl, Germany Stefan Tai, Germany Yuzuru Tanaka, Japan Christopher Ward, USA

2 Paul P. Maglio Mathias Weske Jian Yang Marcelo Fantinato (Eds.) Service-Oriented Computing 8th International Conference, ICSOC 2010 San Francisco, CA, USA, December 7-10, 2010 Proceedings 13

3 Volume Editors Paul P. Maglio IBM Almaden Research Center San Jose, CA, USA Mathias Weske University of Potsdam Potsdam, Germany Jian Yang Macquarie University Sydney, Australia Marcelo Fantinato University of São Paulo São Paulo, Brazil Library of Congress Control Number: Applied for CR Subject Classification (1998): D.2, C.2, H.4, H.3, H.5, J.1 LNCS Sublibrary: SL 2 Programming and Software Engineering ISSN ISBN Springer Berlin Heidelberg New York ISBN 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 2010 Printed in Germany Typesetting: Camera-ready by author, data conversion by Scientific Publishing Services, Chennai, India Printed on acid-free paper 06/3180

4 Preface Welcome to the 8th International Conference on Service Oriented Computing (ICSOC 2010), held in San Francisco, December These proceedings represent high-quality research and industry papers, tutorials, demos, and posters that showcase new developments in service oriented computing and related fields. Since the first meeting in beautiful Trento in 2003, ICSOC has become the premier conference in the rapidly evolving areas of service research. While keeping its roots in scientific excellence and technical depth of service technology, ICSOC 2010 aimed to combine technical aspects of service computing with application and business-oriented aspects of service design, following the recent emergence of service science as an interdisciplinary foundation for understanding and integrating service systems. Located in the center of technology innovation, the San Francisco Bay Area, this year s ICSOC, through its Local Advisory Board, reached out to local industry and academia for keynotes and panels on current topics and to connect technical invention with commercial innovation. The Program Committee faced some tough decisions this year. We received 238 submissions, signalling a growing community of researchers and practitioners working in this multidisciplinary field. All papers were considered carefully by the Program Committee in originality, novelty, rigor, and relevance. In the end, 33 full research papers and three full industry papers were selected, resulting in an acceptance rate of 15%. An additional 18 submissions were accepted as short papers. There were also three PhD symposium posters and four regular posters accepted. Paper and poster presentations were complemented by tutorial and demo programs. All represented the state of the art in service oriented computing. We were fortunate to work with some 100 Program Committee members on paper selection. Without their expertise and dedication, these proceedings and this conference would not have been possible. The high-quality papers resulted from the joint effort of these researchers, who each carefully read, commented on, and corresponded over many submissions. We thank them for their hard work. We were privileged to work with many talented and dedicated colleagues on the Organizing Committee and the Local Advisory Board, particularly Bernd Kraemer, Registration Co-chair, Marcelo Fantinato, Publications Chair, Matthias Weidlich, Publicity Chair, and Maja Vukovic, Web Chair. We apologize that we cannot list all who helped. Please find the complete list in the proceedings.

5 VI Preface A special thanks goes to the authors, keynote speakers, panelists, and tutorial speakers, who together made the conference happen. And of course, our biggest thanks goes to the participants, who make the conference worthwhile. It is our great pleasure and privilege to present these proceedings. We hope you find the volume inspiring for years to come. December 2010 Heiko Ludwig Fu-ren Lin Paul P. Maglio Mathias Weske Jian Yang

6 Organization Honorary General Chair Jim Spohrer IBM, USA General Chairs Heiko Ludwig Fu-Ren Lin IBM Research, USA National Tsing Hua University, Taiwan Program Committee Chairs Mathias Weske Jian Yang Paul Maglio Univ. Potsdam, Germany Mcquarry University, Australia IBM Research, USA Advisory Board Avi Borthakur Claudio Bartolini Christoph Bussler Axel Hochstein Ramesh Jakka Yuecel Karabulut Michael Maximilien Oracle, USA HP Labs, USA Saba Software, USA Stanford University, USA 360 Fresh and Carnegie Mellon Silicon Valley, USA SAP, USA IBM Research, USA Workshop Chairs Gustavo Rossi Soe-Tsyr Yuan Michel Maximilien UNLP, Argentina National Chengchi University, Taiwan IBM Research, USA Tutorial Chairs Thomas Sandholm Jyoti Bhat Haluk Demirkan HP Labs, USA Infosys, India Arizona State University, USA

7 VIII Organization Demonstration Chairs Florian Daniel Christian Zirpins University of Trento, Italy Karlsruhe Institute of Technology, Germany Poster Chairs Andreas Wombacher University of Twente, The Netherlands Finance/Registration Chairs Bernd J. Kraemer Christian Zirpins Fernuni Hagen, Germany Karlsruhe Institute of Technology, Germany PhD Symposium Chairs Eleni Stroulia Boualem Benatallah Jianwen Su University of Alberta, Canada University of New South Wales, Australia University of California at Santa Barbara, USA Web Chair Maja Vukovic IBM Research, USA Publications Chair Marcelo Fantinato University of São Paulo, Brazil Publicity Chair Matthias Weidlich University of Potsdam, Germany Conference Operations Management Beatriz Raggio Xparency, USA

8 Organization IX Program Committee Marco Aiello Rama Akkiraju Alvaro Arenas Karim Baina Luciano Baresi Claudio Bartolini Samik Basu Boualem Benatallah Salima Benbernou Antonia Bertolino Walter Binder Athman Bouguettaya Christoph Bussler Manuel Carro Shiping Chen Lawrence Chung Emmanuel Coquery Francisco Curbera Vincenzo D Andrea Florian Daniel Joseph Davis Mark Davis Flavio De Paoli Haluk Demirkan Frederic Desprez Khalil Drira Marlon Dumas Schahram Dustdar Markus Endler Gregor Engels Rik Eshuis Ioannis Fikouras Howard Foster Andreas Friesen Hiroaki Fukuda Dragan Gasevic Paolo Giorgini Carlo Ghezzi Sven Graupner Jeff Gray Paul Grefen University of Groningen, The Netherlands IBM Research, USA STFC Rutherford Appleton Laboratory, USA Mohammed V-Souissi University, Morocco Politecnico di Milano, Italy HP Labs, USA Iowa State University, USA University of New South Wales, Australia University of Paris, France ISTI-CNR, Italy University of Lugano, Switzerland CSIRO, Australia BEA, USA Universidad Politécnica de Madrid, Spain CSIRO ICT, Australia University of Texas at Dallas, USA Université Claude Bernard Lyon 1, France IBM Research, USA University of Trento, Italy University of Trento, Italy University of Sydney, Australia Bentley University, USA Universita di Milano, Italy Arizona State University, USA INRIA, France LAAS Toulouse, France University of Tartu, Estonia University of Technology Vienna, Austria PUC-Rio de Janeiro, Brazil University of Paderborn, Germany Eindhoven University of Technology, The Netherlands Ericsson, Sweden City University London, UK SAP, USA Keio University, Japan Athabasca University, Canada University of Trento, Italy Politecnico di Milano, Italy HP Labs, Palo Alto, USA University of Alabama at Birmingham, USA Eindhoven University of Technology, The Netherlands

9 X Organization Peng Han Chongqing Academy of Science and Tech., China Alan Hartman IBM Research, India Manfred Hauswirth DERI Galway, Ireland W.J.A.M. van den Heuvel University of Tilburg, The Netherlands Valerie Issarny INRIA Paris-Rocquencourt, France Hans-Arno Jacobsen University of Toronto, Canada Eser Kandogan IBM Research, USA Yuecel Karabulut SAP, USA Kamal Karlapalem IIIT-H, India Dimka Karastoyanova University of Stuttgart, Germany Rania Khalaf IBM T.J. Watson Research Center, USA Markus Kirchberg Agency for Science, Tech. and Research, Singapore Jana Khler IBM Zurich Research Lab, Switzerland Bernd Kraemer Fernuni Hagen, Germany Jeff Kreulen IBM Almaden Research Center, USA Steve Kwan San Jose State University, USA Patricia Lago Free University Amsterdam, The Netherlands Winfried Lamersdorf University of Hamburg, Germany Frank Leymann University of Stuttgart, Germany Fu-Ren Lin National Tsing Hua University, Taiwan Lin Liu Tsing Hua University, China Xumin Liu Rochester Institute of Technology, USA Bertram Ludaescher University of California at Davis, USA Zaki Malik Wayne State University, USA Esperanza Marcos Universidad Rey Juan Carlos, Spain Michael Maximilien IBM Research, USA Massimo Mecella Universita di Roma, Italy Nikolay Mehandjiev University of Manchester, UK Hamid Motahari-Nezhad HP Lab, USA Michael Mrissa University of Lyon, France Surya Nepal CSIRO, Australia Christos Nikolaou University of Crete, Greece Olga Ormandjieva Concordia University, Canada Guadalupe Ortiz University of Extremadura, Spain Caesare Pautasso University of Lugano, Switzerland Klaus Pohl Duisburg-Essen University, Germany Frank Puhlmann inubit AG, Germany Mu Qiao Pennsylvania State University, USA Robin Qiu Pennsylvania State University, USA Omer Rana University of Cardiff, UK Manfred Reichert University of Ulm, Germany Wolfgang Reisig Humboldt University, Germany

10 Organization XI Colette Roland University of Paris, France Florian Rosenberg ICT CSIRO, Australia Gustavo Rossi UNLP, Argentina Masoud Sadjadi Florida International University, USA Mohand-Said Hacid University of Lyon, France Jorge Sanz IBM Almaden Research Center, USA Regis Saint-Paul CREATE-NET International Research Center, Italy Ramesh Jakka 360 Fresh and Carnegie Mellon Silicon Valley, USA Daniel Schwabe PUC-Rio de Janeiro, Brazil Michael J. Shaw University of Illinois, Urbana Champaign, USA Jane Siegel Carnegie Mellon Silicon Valley, USA Munindar P. Singh North Carolina State University, USA Ignacio Silva-Lepe IBM T.J. Watson Research Center, USA George Spanoudakis City University London, UK Bruce Spencer NRC, Canada Jianwen Su UC Santa Barbara, USA York Sure GESIS Inst. and University of Koblenz-Landau, Germany Jun Suzuki University of Massachusetts, Boston, USA Stefan Tai University of Karlsruhe, Germany Wang-Chiew Tan IBM Research, USA Zahir Tari RMIT University, Australia M. Beatriz F. Toledo Unicamp, Brazil Farouk Toumani Blaise Pascal University, France Peter Troeger HI, University of Potsdam, Germany Jos van Hillegersberg University of Twente, The Netherlands Changzhou Wang The Boeing Company, USA Yan Wang Macquarie University, Australia Bruno Wassermann University College London, UK Michael Weiss Carleton University, Canada Karsten Wolf University of Rostock, Germany Andreas Wombacher University of Twente, The Netherlands Lai Xu Bournemouth University, UK Ramin Yahyapour TU Dortmund University, Germany Yelena Yesha University of Maryland, USA Hossein Zadeh RMIT, Australia Konstantinos Zachos City University London, UK Weiliang Zhao Macquarie University, Australia Andrea Zisman City University London, UK Yan Zheng Nokia Research Center Helsinki, Finland

11 Table of Contents Research Papers Service and Business Process Modeling (1) Business Process Model Abstraction Based on Behavioral Profiles... 1 Sergey Smirnov, Matthias Weidlich, and Jan Mendling Root-Cause Analysis of Design-Time Compliance Violations on the Basis of Property Patterns Amal Elgammal, Oktay Turetken, Willem-Jan van den Heuvel, and Mike Papazoglou Artifact-Centric Choreographies Niels Lohmann and Karsten Wolf Service and Business Process Modeling (2) Resolving Business Process Interference via Dynamic Reconfiguration Nick R.T.P. van Beest, Pavel Bulanov, Hans Wortmann, and Alexander Lazovik Linked Data and Service Orientation Erik Wilde Risk Sensitive Value of Changed Information for Selective Querying of Web Services John Harney and Prashant Doshi Service Management (1) Adaptive Service Composition Based on Reinforcement Learning Hongbing Wang, Xuan Zhou, Xiang Zhou, Weihong Liu, Wenya Li, and Athman Bouguettaya A Service Execution Control Framework for Policy Enforcement Masahiro Tanaka, Yohei Murakami, and Donghui Lin An Integrated Solution for Runtime Compliance Governance in SOA Aliaksandr Birukou, Vincenzo D Andrea, Frank Leymann, Jacek Serafinski, Patricia Silveira, Steve Strauch, and Marek Tluczek

12 XIV Table of Contents Service Management (2) A Differentiation-Aware Fault-Tolerant Framework for Web Services Gerald Kotonya and Stephen Hall Repair vs. Recomposition for Broken Service Compositions Yuhong Yan, Pascal Poizat, and Ludeng Zhao Interoperation, Composition and Simulation of Services at Home Eirini Kaldeli, Ehsan Ullah Warriach, Jaap Bresser, Alexander Lazovik, and Marco Aiello Quality of Service Efficient QoS-Aware Service Composition with a Probabilistic Service Selection Policy Adrian Klein, Fuyuki Ishikawa, and Shinichi Honiden Using Real-Time Scheduling Principles in Web Service Clusters to Achieve Predictability of Service Execution Vidura Gamini Abhaya, Zahir Tari, and Peter Bertok Aggregate Quality of Service Computation for Composite Services Marlon Dumas, Luciano García-Bañuelos, Artem Polyvyanyy, Yong Yang, and Liang Zhang Service Science and Design Creating Context-Adaptive Business Processes Gabriel Hermosillo, Lionel Seinturier, and Laurence Duchien Statistical Quality Control for Human-Based Electronic Services Robert Kern, Hans Thies, and Gerhard Satzger A Requirement-Centric Approach to Web Service Modeling, Discovery, and Selection Maha Driss, Naouel Moha, Yassine Jamoussi, Jean-Marc Jézéquel, and Henda Hajjami Ben Ghézala Service Development and Run-Time Management Spreadsheet as a Generic Purpose Mashup Development Environment Dat Dac Hoang, Hye-Young Paik, and Anne H.H. Ngu

13 Table of Contents XV Combining Enforcement Strategies in Service Oriented Architectures Gabriela Gheorghe, Bruno Crispo, Daniel Schleicher, Tobias Anstett, Frank Leymann, Ralph Mietzner, and Ganna Monakova Fault Handling in the Web Service Stack Oliver Kopp, Frank Leymann, and Daniel Wutke High-Level Description Languages Conjunctive Artifact-Centric Services Piero Cangialosi, Giuseppe De Giacomo, Riccardo De Masellis, and Riccardo Rosati Diagnosis of Service Failures by Trace Analysis with Partial Knowledge Wolfgang Mayer, Gerhard Friedrich, and Markus Stumptner Automatic Fragment Identification in Workflows Based on Sharing Analysis Dragan Ivanović, Manuel Carro, and Manuel Hermenegildo Service Level Agreements Preventing SLA Violations in Service Compositions Using Aspect-Based Fragment Substitution Philipp Leitner, Branimir Wetzstein, Dimka Karastoyanova, Waldemar Hummer, Schahram Dustdar, and Frank Leymann Adaptive Management of Composite Services under Percentile-Based Service Level Agreements Valeria Cardellini, Emiliano Casalicchio, Vincenzo Grassi, and FrancescoLoPresti BPMN Modelling of Services with Dynamically Reconfigurable Transactions Laura Bocchi, Roberto Guanciale, Daniele Strollo, and Emilio Tuosto Service Engineering Methodologies Programmable Fault Injection Testbeds for Complex SOA Lukasz Juszczyk and Schahram Dustdar Abstracting and Applying Business Modeling Patterns from RosettaNet Pankaj R. Telang and Munindar P. Singh

14 XVI Table of Contents Heuristic Approaches for QoS-Based Service Selection Diana Comes, Harun Baraki, Roland Reichle, Michael Zapf, and Kurt Geihs Service Security, Privacy, and Trust From Quality to Utility: Adaptive Service Selection Framework Chung-Wei Hang and Munindar P. Singh Trust Assessment for Web Services under Uncertainty Zaki Malik and Brahim Medjahed Incorporating Expectations as a Basis for Business Service Selection Adel M. ElMessiry, Xibin Gao, and Munindar P. Singh Industry Papers Enhancing Collaboration with IBM s Rational Jazz tm Laura Anderson, Bala Jegadeesan, Kenneth Johns, Mario Lichtsinn, Priti Mullan, James Rhodes, Akhilesh Sharma, Ray Strong, and Ruoyi Zhou Discovering Business Process Similarities: An Empirical Study with SAP Best Practice Business Processes Rama Akkiraju and Anca Ivan A Scalable and Highly Available Brokering Service for SLA-Based Composite Services Alessandro Bellucci, Valeria Cardellini, Valerio Di Valerio, and Stefano Iannucci Short Papers Business Service Modeling Business Artifacts Discovery and Modeling Zakaria Maamar, Youakim Badr, and Nanjangud C. Narendra Carbon-Aware Business Process Design in Abnoba Konstantin Hoesch-Klohe and Aditya Ghose On Predicting Impacts of Customizations to Standard Business Processes Pietro Mazzoleni, Aubrey Rembert, Rama Akkiraju, and Rong (Emily) Liu

15 Table of Contents XVII Extended WS-Agreement Protocol to Support Multi-round Negotiations and Renegotiations Christoph Langguth and Heiko Schuldt Run-Time Service Management Event-Driven Virtual Machine for Business Integration Middleware Joachim H. Frank, Liangzhao Zeng, and Henry Chang Consistent Integration of Selection and Replacement Methods under Different Expectations in Service Composition and Partner Management Life-Cycle Fuyuki Ishikawa Optimizing the Configuration of Web Service Monitors Garth Heward, Jun Han, Ingo Müller, Jean-Guy Schneider, and Steve Versteeg Formal Methods A Soft Constraint-Based Approach to QoS-Aware Service Selection Mohamed Anis Zemni, Salima Benbernou, and Manuel Carro Timed Conversational Protocol Based Approach for Web Services Analysis Nawal Guermouche and Claude Godart Service Discovery Using Communication Fingerprints Olivia Oanea, Jan Sürmeli, and Karsten Wolf Quantifying Service Compatibility: A Step beyond the Boolean Approaches Meriem Ouederni, Gwen Salaün, and Ernesto Pimentel Quality of Service Consistency Benchmarking: Evaluating the Consistency Behavior of Middleware Services in the Cloud Markus Klems, Michael Menzel, and Robin Fischer Service Composition with Pareto-Optimality of Time-Dependent QoS Attributes Benjamin Klöpper, Fuyuki Ishikawa, and Shinichi Honiden QoS-Based Optimization of Service Compositions for Complex Workflows Dieter Schuller, André Miede, Julian Eckert, Ulrich Lampe, Apostolos Papageorgiou, and Ralf Steinmetz

16 XVIII Table of Contents Privacy-Aware Device Identifier through a Trusted Web Service Marcelo da Cruz Pinto, Ricardo Morin, Maria Emilia Torino, and Danny Varner Service Applications Towards Mitigating Human Errors in IT Change Management Process Venkateswara R. Madduri, Manish Gupta, Pradipta De, and Vishal Anand A Service-Based Architecture for Multi-domain Search on the Web Alessandro Bozzon, Marco Brambilla, Francesco Corcoglioniti, and Salvatore Vadacca Natural Language Service Composition with Request Disambiguation Florin-Claudiu Pop, Marcel Cremene, Mircea Vaida, and Michel Riveill Posters Families of SOA Migration Maryam Razavian and Patricia Lago An Ontology Based Approach for Cloud Services Catalog Management Yu Deng, Michael R. Head, Andrzej Kochut, Jonathan Munson, Anca Sailer, and Hidayatullah Shaikh A Scalable Cloud-Based Queueing Service with Improved Consistency Levels Han Chen, Fan Ye, Minkyong Kim, and Hui Lei Exploring Simulation-Based Configuration Decisions Michael Smit and Eleni Stroulia PhD Symposium Posters Efficient, Failure-Resilient Semantic Web Service Planning Florian Wagner (Advisors: Fuyuki Ishikawa and Shinichi Honiden) Integrated Service Process Adaptation Zhe Shan (Advisor: Dr. Akhil Kumar) Contract Based, Non-invasive, Black-Box Testing of Web Services Michael Averstegge (Advisor: Bernd J. Kraemer)

17 Table of Contents XIX Demonstration Papers Managing Process Model Collections with AProMoRe M.C. Fauvet, M. La Rosa, M. Sadegh, A. Alshareef, R.M. Dijkman, Luciano García-Bañuelos, H.A. Reijers, W.M.P. van der Aalst, Marlon Dumas, and Jan Mendling Managing Long-Tail Processes Using FormSys Ingo Weber, Hye-Young Paik, Boualem Benatallah, Corren Vorwerk, Zifei Gong, Liangliang Zheng, and Sung Wook Kim Managing Web Services: An Application in Bioinformatics Athman Bouguettaya, Shiping Chen, Lily Li, Dongxi Liu, Qing Liu, Surya Nepal, Wanita Sherchan, Jemma Wu, and Xuan Zhou An Integrated Solution for Runtime Compliance Governance in SOA Aliaksandr Birukou, Agnieszka Betkowska Cavalcante, Fabio Casati, Soudip Roy Chowdhury, Vincenzo D Andrea, Frank Leymann, Ernst Oberortner, Jacek Serafinski, Patricia Silveira, Steve Strauch, and Marek Tluczek Event-Driven Privacy Aware Infrastructure for Social and Health Systems Interoperability: CSS Platform Giampaolo Armellin, Dario Betti, Fabio Casati, Annamaria Chiasera, Gloria Martinez, Jovan Stevovic, and Tefo James Toai Mashups with Mashlight Luciano Baresi and Sam Guinea A Service Mashup Tool for Open Document Collaboration Nelly Schuster, Raffael Stein, Christian Zirpins, and Stefan Tai Panta Rhei: Optimized and Ranked Data Processing over Heterogeneous Sources Daniele Braga, Francesco Corcoglioniti, Michael Grossniklaus, and Salvatore Vadacca RnR: A System for Extracting Rationale from Online Reviews and Ratings Dwi A.P. Rahayu, Shonali Krishnaswamy, Cyril Labbe, and Oshadi Alhakoon Liquid Course Artifacts Software Platform Marcos Baez, Boualem Benatallah, Fabio Casati, Van M. Chhieng, Alejandro Mussi, and Qamal Kosim Satyaputra A Programmble Fault Injection Testbed Generator for SOA Lukasz Juszczyk and Schahram Dustdar

18 XX Table of Contents BPEL n Aspects&Compensation: Adapted Service Orchestration Logic and Its Compensation Using Aspects Mirko Sonntag and Dimka Karastoyanova A Tool for Integrating Pervasive Services and Simulating Their Composition Ehsan Ullah Warriach, Eirini Kaldeli, Jaap Bresser, Alexander Lazovik, and Marco Aiello BPEL4Pegasus: Combining Business and Scientific Workflows Mirko Sonntag, Dimka Karastoyanova, and Ewa Deelman Tutorial Abstracts Multidisciplinary Views of Business Contracts Munindar P. Singh and Nirmit Desai Quantitative Service Analysis Naveen Kulkarni, Deepti Parachuri, and Shashank Trivedi Scalable Services: Understanding Architecture Trade-off Markus Klems and Stefan Tai Crowd-Driven Processes: State of the Art and Research Challenges Maja Vukovic and Claudio Bartolini Author Index