Publications
2010
Rittgen, Peter: IT support in collaborative modelling of business processes – a comparative experiment, International Journal of Organisational Design and Engineering, 1 (1/2), 2010, pp. 98-108
Rittgen, Peter: Collaborative Modeling – Roles, Activities and Team Organization, International Journal of Information System Modeling and Design, 1(3), 2010, pp. 1-19
Rittgen, Peter: Success Factors of e-Collaboration in Business Process Modeling, in Pernici, Barbara (ed.): Advanced Information Systems Engineering, 22nd International Conference, CAiSE 2010, Hammamet, Tunisia, June 2010, Proceedings, LNCS 6051, Berlin, Germany: Springer, 2010, pp. 24-37
Rittgen, Peter: Quality and Perceived Usefulness of Process Models, Proceedings of the 25th Annual ACM Symposium on Applied Computing, March 22 - 26, 2010, Sierre, Switzerland, 2010, pp. 65-72
Rittgen, Peter: Collaborative Business Process Modeling – Tool Support for Solving Typical Problems, Proceedings of the Conf-IRM 2010 "Collaboration and Community in a Global World", May 16 - 18, 2010, Montego Bay, Jamaica, 2010
2009
Rittgen, Peter (ed.): Journal of Electronic Commerce Research, 10(1), 2009
Rittgen, Peter (ed.): International Journal of eCollaboration, 5(4), 2009
Rittgen, Peter: Self-organization of interorganizational process design, Electronic Markets, 19(4), 2009, pp. 189-199
Rittgen, Peter: Collaborative Business and Information Systems Design, International Journal of eCollaboration, 5(4), 2009, pp. 1-15
Rittgen, Peter: Collaborative Modeling, Business Process Magazine, 7, 2009, pp. 32-35
Rittgen, Peter: Collaborative Modeling – A Design Science Approach, Proceedings of the 42nd Hawaii International Conference on System Sciences (HICSS-42), Waikoloa, Big Island, Hawaii, USA, January 5-8, 2009, CD-ROM, Los Alamitos, CA: IEEE Computer Society, 2009, 10 p. (nominated for best paper award)
Rittgen, Peter: Collaborative Modeling of Business Processes – A Comparative Case Study, Proceedings of the 24th Annual ACM Symposium on Applied Computing, March 9 - 12, 2009, Waikiki Beach, Honolulu, Hawaii, 2009, pp. 225-230
Rittgen, Peter: Collaborative Design of Models, Proceedings of the IADIS International Conference Interfaces and Human Computer Interaction (IHCI) 2009, Algarve, Portugal, 20-22 June 2009
Rittgen, Peter: Business Ontologies, in Healy, Michael; Kameas, Achilles; Poli, Roberto (eds): Theory and Applications of Ontology, vol. 2, The Information-science Stance, 2009, to appear
Lind, Mikael; Rittgen, Peter: The Challenges of Co-Design and the Case of e-ME, in Whitworth, Brian; de Moor; Aldo (eds): Handbook of Research on Socio-Technical Design and Social Networking Systems, Hershey, PA: Information Science Reference, 2009, pp. 265-279
Rittgen, Peter: Supporting Inter-Business Collaboration via Contract Negotiation and Enactment, in Salmons, Janet; Wilson, Lynn (eds.): Handbook of Research on Electronic Collaboration and Organizational Synergy, Vol. II, Hershey, PA: Information Science Reference, 2009, pp. 487-499
2008
Rittgen, Peter (ed.): Handbook of Ontologies for Business Interaction, Hershey, PA: IGI Global, 2008
Rittgen, Peter: Towards a Meta-model for Socio-Instrumental Pragmatism, in Rittgen, Peter (ed.): Handbook of Ontologies for Business Interaction, Hershey, PA: Information Science Reference, 2008, pp. 87-100
Rittgen, Peter: Designing and Implementing Contracts for Smart Business Networks, in Vervest, Peter; Heck, Eric van; Preiss, Kenneth (eds): Smart Business Networks - a new Business Paradigm, Smart Business Networks Initiative (SBNi), Rotterdam School of Management, Erasmus University Rotterdam, 2008, pp. 320-335
Rittgen, Peter: Designing Contracts for Business Networks, in Putnik, Goran D.; Cunha, Maria Manuela (eds): Encyclopedia of Networked and Virtual Organizations, Hershey, PA: Information Science Reference, 2008, pp. 395-401
Rittgen, Peter: A Contract-based Architecture for Business Networks, International Journal of Electronic Commerce, 12 (2008) 4, pp. 119–150
Rittgen, Peter: From Business Process Model to Information Systems Model: Integrating DEMO and UML, in Syed, Mahbubur (ed.): Handbook of Research on Modern Systems Analysis and Design Technologies and Applications, Hershey, PA: Information Science Reference, 2008, pp. 190-200
Rittgen, Peter: Modeling Information Systems in UML, in Khosrow-Pour, Mehdi (Ed.): Encyclopedia of Information Science and Technology, 2nd ed., Hershey, PA: Information Science Reference, 2008, pp. 2651-2656
Rittgen, Peter: Supporting Electronic Collaboration in Conceptual Modeling, in Kamel, Sherif (ed.): Proceedings of the 2008 International Conference on Information Resources Management (Conf-IRM 2008), Niagara Falls, Ontario, Canada, May 18-20, 2008. Hershey, PA: IGI Global, 2008, paper 73F
Rittgen, Peter: COMA: A Tool for Collaborative Modeling, in Bellahsene, Zohra; Woo, Carson; Hunt, Ela; Franch, Xavier; Coletta, Remi (eds.): Proceedings of the Forum at the CAiSE'08 Conference, Montpellier, France, June 18-20, 2008. CEUR Workshop Proceedings 344, CEUR-WS.org, 2008, pp. 61-64
Rittgen, Peter: Modeling Business Actions, in Cartelli, Antonio; Palma, Marco (eds): Encyclopedia of Information Communication Technology, Hershey, PA: IGI Global, pp. 554-562
2007
Rittgen, Peter: Coordinating Interorganizational Business Processes via Trading Partner Agreements, Systems, Signs and Actions, 3 (2007) 1, pp. 58-76
Rittgen, Peter: Negotiating and Enacting Contracts for Business Networks, Journal of the Brazilian Computer Society, 13 (2007) 3, pp. 7-26
Rittgen, Peter: Co-designing Models for Enterprises and Information Systems – a Case for Language Integration, in Magyar, G.; Knapp, G.; Wojtkowski, W.G.; Zupancic, J. (eds): Advances in Information Systems Development: New Methods and Practice for the Networked Society. Volume 1. Proceedings of the 15th International Conference on Information Systems Development, 31 August – 2 September, 2006, University of Technology and Economics, Budapest, Hungary, Springer, Berlin, 2007, pp. 73-83
Rittgen, Peter: Negotiating Models, in Krogstie, John; Opdahl, Andreas; Sindre, Guttorm (eds.): Advanced Information Systems Engineering, 19th International Conference, CAiSE 2007, Trondheim, Norway, June 2007, Proceedings, LNCS 4495, Berlin, Germany: Springer, 2007, pp. 561-573
Rittgen. Peter: Co-Evolution of Business Action Theories and Languages, in Österle, Hubert; Schelp, Joachim; Winter, Robert (eds): Proceedings of the 15th European Conference on Information Systems (ECIS 2007), «Relevant rigour – Rigorous relevance», St. Gallen, June 07-09, 2007, pp. 1977-1989 (nominated for best paper award)
Rittgen, Peter: Supporting Interorganizational Processes with Interaction Flows and Business Rules, in Khosrow-Pour, Mehdi (ed.): Managing Worldwide Operations and Communications with Information Technology, 2007 Information Resources Management Association International Conference, Vancouver, BC, Canada, May 19-23, 2007. Hershey, PA: IGI Global, 2007, pp. 13-16
Rittgen, Peter: Multi-Grounded Development of Enterprise Modeling Methods: The Case of SIMM, in Khosrow-Pour, Mehdi (ed.): Managing Worldwide Operations and Communications with Information Technology, 2007 Information Resources Management Association International Conference, Vancouver, BC, Canada, May 19-23, 2007. Hershey, PA: IGI Global, 2007, pp. 22-26
Rittgen, Peter: Towards a Meta-Model for Socio-Instrumental Pragmatism, in Khosrow-Pour, Mehdi (ed.): Managing Worldwide Operations and Communications with Information Technology, 2007 Information Resources Management Association International Conference, Vancouver, BC, Canada, May 19-23, 2007. Hershey, PA: IGI Global, 2007, pp. 1013-1017
Rittgen, Peter: Supporting Inter-Business Collaboration via Contract Negotiation and Enactment, in Oberweis, Andreas; Weinhardt, Christof; Gimpel, Henner; Koschmider, Agnes; Pankratius, Victor; Schnizler, Björn (eds): eOrganisation: Service-, Prozess-, Market-Engineering, 8. Internationale Tagung Wirtschaftsinformatik, Karlsruhe, 28. Februar - 2. März 2007, Band 1, Karlsruhe, Germany: universitätsverlag karlsruhe, pp. 661-676
Rittgen, Peter: Supporting the Design of Service Contracts with Interaction Models, International Journal of Internet and Enterprise Management 5 (2007) 1, pp. 5-22
Rittgen, Peter: Integrating Business Processes and Information Systems in an Interorganizational Context, in Cunha, Manuela; Cortes Bruno; Putnik, Goran (eds): Knowledge and Technology Management in Virtual Organizations: Issues, Trends, Opportunities and Solutions, Hershey, PA: IGI Global, 2007, pp. 136-153
Rittgen, Peter: A Language-Action Approach to the Design of UML Models, in: Rittgen, Peter (ed.): Enterprise Modeling and Computing with UML, Hershey, PA: IGI Global, 2006, pp. 135-152
Rittgen, Peter (ed.): Enterprise Modeling and Computing with UML, Hershey, PA: Idea Group, 2007
2006
Rittgen, Peter: A Language-Mapping Approach to Action-oriented Development of Information Systems, European Journal of Information Systems, 15 (2006) 1, pp. 70-81
Rittgen, Peter: Deriving Concepts for Modeling Business Actions, in Embley, D.W.; Olivé, A.; Ram, S. (eds): Proceedings of the 25th International Conference on Conceptual Modeling (ER 2006), Nov. 6-9, 2006, Tucson, AZ, Lecture Notes in Computer Science, vol. 4215, Springer, Berlin, 2006, pp. 468-481
Rittgen, Peter: Towards a Language for Business Action Theory, in: Action in Language, Organisations and Information Systems ALOIS 2006, Proceedings of the 4th International Conference, Borås, Sweden, 1-2 November, 2006, pp. 3-16
Rittgen, Peter: Supporting Planned and Ad-Hoc Changes of Business Processes, in: Latour, Tibout; Petit, Michael (Eds.): The 18th International Conference on Advanced Information Systems Engineering (CAiSE 2006). Proceedings of Workshops and Doctoral Consortium. 7th Workshop on Business Process Modeling, Development, and Support (BPMDS'06), “Requirements for flexibility and the ways to achieve it”, Luxembourg, 5 – 6 June 2006, Presses universitaires de Namur (Namur University Press), Namur, Belgium, 2006, pp. 105-111
Rittgen, Peter: Integrating Organizations in a Supply Chain with Electronic Contracts, in: Soliman, Khalid S. (ed.): Managing Information in the Digital Economy: Issues & Solutions. Proceedings of the 6th International Business Information Management (IBIMA) Conference, June 19 - 21, 2006, Bonn, Germany, IBIMA, Mineola, NY, pp. 44-51
Rittgen, Peter: Translating Metaphors into Design Patterns, in Nilsson, Anders G.; Gustas, Remigijus; Wojtkowski, Wita; Wojtkowski, W. Gregory; Wrycza, Stanisław; Zupančič, Jože (eds): Advances in Information Systems Development - Bridging the Gap between Academia and Industry, Proceedings of the Fourteenth International Conference on Information Systems Development (ISD'2005), Karlstad, Sweden, August 14-17, 2005, vol. 1 of 2. Springer, Berlin, 2006, pp. 425-436
Rittgen, Peter: Supporting Interactions Between Organizations with Language-Action Models, in Khosrow-Pour, Mehdi (ed.): Emerging Trends and Challenges in Information Technology Management, 2006 Information Resources Management Association International Conference, Washington, DC, USA, May 21-24, 2006. Hershey, PA: IGI Global, 2006, pp. 172-175
Rittgen, Peter: Users as Subjects in and of Co-design, in Khosrow-Pour, Mehdi (ed.): Emerging Trends and Challenges in Information Technology Management, 2006 Information Resources Management Association International Conference, Washington, DC, USA, May 21-24, 2006. Hershey, PA: IGI Global, 2006, pp. 459-461
2005
Rittgen, Peter: Deriving Simulation Models from Business Process Models, INFOCOMP Journal, 4 (2005) 3, pp. 23-31
Rittgen, Peter: Modeling Information Systems in UML, in Khosrow-Pour, Mehdi (ed.): Encyclopedia of Information Science and Technology, Vol. I-V, Hershey, PA: IRM Press, 2005, pp. 2001-2006
Rittgen, Peter: Metaphors in Co-Design, in: Soliman, Khalid S. (ed.): Internet and Information Technology in Modern Organizations: Challenges & Answers. Proceedings of the 5th International Business Information Management (IBIMA) Conference, Cairo, Egypt, 13-15 December 2005, IBIMA, Mineola, NY, pp. 363-368
Rittgen, Peter: A Language-Action Perspective on the Design of Information Systems, in: Soliman, Khalid S. (ed.): Proceedings of the 4th International Business Information Management (IBIMA) Conference, Lisbon, Portugal, 5-7 July 2005, IBIMA, Mineola, NY, pp. 90-95
Rittgen, Peter: Language Action-Based Simulation of Business Processes, in: Goldkuhl, Göran; Lind, Mikael and Haraldson, Sandra (eds): Proceedings of the 10th Anniversary International Working Conference on the Language-Action Perspective on Communication Modelling, Kiruna, Lapland, Sweden, June 19-20, 2005, pp. 119-130
Rittgen, Peter: A Framework for Language-Action Modeling in UML, in Khosrow-Pour, Mehdi (ed.): Managing Modern Organizations With Information Technology, 2005 Information Resources Management Association International Conference, San Diego, CA, USA, May 15-18, 2005. Hershey, PA: Idea Group Publishing, 2005, pp. 294-297
Rittgen, Peter: Action-oriented Development of Information Systems: A Language-Mapping Approach, in: Ågerfalk, Pär J; Bannon, Liam and Fitzgerald, Brian (eds): Action in Language, Organisations and Information Systems ALOIS 2005, Proceedings of the 3rd International Conference, Limerick, Ireland, 15-16 March, 2005, pp. 114-132
2004
Rittgen, Peter: Organizational Modeling and E-Business Software, in: Soliman, Khalid S. (ed.): E-Business & Organizations in the 21st Century, 3rd International Business Information Management (IBIMA) Conference, Cozumel, Mexico, December 14-16, 2004
Rittgen, Peter: Workflows in UML, in: Khosrow-Pour, Mehdi (ed.): Innovations Through Information Technology, 2004 Information Resources Management Association International Conference, New Orleans, LA, USA, May 23-26, 2004, Hershey, PA: Idea Group Publishing, 2004, pp. 755-758
2003
Rittgen, Peter: Business Processes in UML, in Favre, Liliana (ed.): UML and the Unified Process, Hershey, PA: IRM Press, 2003, pp. 315 - 331
Rittgen, Peter: Business Process Diagrams: An UML Extension, in: Khosrow-Pour, Mehdi (ed.): Information Technology and Organizations: Trends, Issues, Challenges and Solutions, 2003 Information Resources Management Association International Conference, Philadelphia, Pennsylvania, USA, May 18-21, 2003, Hershey, PA: Idea Group Publishing, 2003, pp. 560-563
2002
Rittgen, Peter: EMC - A Modeling Method for Developing Web-based Applications, in Slooten, Kees van (ed.): Optimal Information Modeling Techniques, Hershey, PA: IRM Press, 2002, pp. 207-220
Rittgen, Peter: Tailoring Information to the Needs of Clients, Informing Science and Information Technology Education Conference (InSITE) 2002, Cork, Ireland, June 19-21, 2002, published online at http://proceedings.elicohen.net/, pp. 1343-1355
Rittgen, Peter; Turowski, Klaus: UML Design Patterns for Business Processes, in: Khosrow-Pour, Mehdi (ed.): Issues and Trends of Information Technology Management in Contemporary Organizations, Proceedings of the International Conference of the International Resources Management Association (IRMA) 2002, Seattle, Washington, USA, May 19 - 22, Hershey, PA: Idea Group Publishing, 2002, pp. 679-681
2001
Rittgen, Peter: Process-Oriented EDI, in: Smithson, S. et al. (eds): Global Co-Operation in the New Millennium, Proceedings of the European Conference on Information Systems (ECIS) 2001, Bled, Slovenia, June 27-29, 2001, Kranj: Moderna organizacija, 2001, pp.356-367
Rittgen, Peter: E-Commerce Software: From Analysis to Design, in: Gangopadhyay, Aryya (ed.): Managing Business with Electronic Commerce: Issues and Trends, Hershey, PA: Idea Group, 2001, pp. 17 - 36
Dehnert, Juliane; Rittgen, Peter: Relaxed Soundness of Business Processes, in: Dittrich, K.R.; Geppert, A.; Norrie, M.C. (eds): Advanced Information Systems Engineering, 13th International Conference, CAiSE 2001, Interlaken, Switzerland, June 4-8, 2001. Proceedings. Lecture Notes in Computer Science 2068, Berlin: Springer, 2001, pp. 157-170
2000
Rittgen, Peter: Paving the Road to Business Process Automation, European Conference on Information Systems (ECIS) 2000, Vienna, Austria, July 3 - 5, 2000, pp. 313-319
Rittgen, Peter: EMC - A Modeling Method for Developing Web-based Applications, International Conference of the International Resources Management Association (IRMA) 2000, Anchorage, Alaska, USA, May 21 - 24, 2000, pp. 135-140
Rittgen, Peter: On the Classification of Associations, in: Ebert., J.; Frank, U. (eds): Modelle und Modellierungssprachen in Informatik und Wirtschaftsinformatik, Beiträge des Workshops "Modellierung 2000", St. Goar, April 5 - 7, 2000, pp. 103 - 110
Rittgen, Peter: Quo vadis Event-driven Process Chain? - Suggestions for Syntactical Improvements and a Formal Semantics, WIRTSCHAFTSINFORMATIK, 42 (2000) 1, pp. 27 - 35 (in German)
Prasse, M., Rittgen, P.: Success Factors and Future Challenges for the Development of Object Orientation, Working paper 20, IS Institute (IWI), University Koblenz-Landau, 2000
1999
Rittgen, P.: Modified EPCs and Their Formal Semantics, Working paper 19, IS Institute (IWI), University Koblenz-Landau, 1999
Rittgen, Peter: Object-oriented Analysis using Event-driven Method Chains, Proceedings der MobIS-Fachtagung 1999, October 14 - 15, University Bamberg, Rundbrief der GI-Fachgruppe 5.10, volume 6, issue 1, Bamberg, Oktober 1999, pp. 8-23 (in German)
Rittgen, Peter: From Process Model to Electronic Business Process, in: European Conference on Information Systems ECIS 1999, June 23 - 25, Copenhagen Business School, Copenhagen, Denmark, proceedings, volume II, 1999, pp. 616 ff.
Rittgen, P.: From Process Model to Electronic Business Process, Working paper 17, IS Institute (IWI), University Koblenz-Landau, 1999 (in German)
Glabbeek, Rob van; Rittgen, Peter: Scheduling Algebra, in: Haeberer, Armando Martin (ed.): Algebraic Methodology And Software Technology (AMAST), 7th international conference, proceedings, Amazonia, Brazil, January 4 - 8, 1999, Lecture Notes in Computer Science 1548, Springer, Berlin, 1999, pp. 278 - 292
1998
Prasse, Michael; Rittgen, Peter: Why Church's Thesis Still Holds - Some Notes on Peter Wegner's Tracts on Interaction and Computability, Computer Journal 41 (1998) 6, pp. 357 - 362
Glabbeek, Rob van; Rittgen, Peter: Scheduling Algebra, Stanford Technical Note, STAN-CS-TN-98-87, Stanford University, December, 1998
Prasse, Michael; Rittgen, Peter: Remarks on Peter Wegner’s Tracts on Interaction and Computability, Informatik Spektrum, 21 (1998) 3, pp. 141 - 146 (in German)
Rittgen, Peter: Process Theory of Scheduling - Algebraic Modeling of Processes, Resource Constraints and Time, dissertation (rev.), Teubner, Leipzig, 1998 (in German)
Glabbeek, Rob van; Rittgen, Peter: Scheduling Algebra, Working paper 12, IS Institute (IWI), University Koblenz-Landau
Frank, U.; Rittgen, Peter: Enriching Modeling Methods with Domain-specific Knowledge: Chances and Challenges of Enterprise Modeling, in: Pohl, Klaus; Schürr, Andy; Vossen, Gottfried (eds): Proceedings Modellierung '98, Münster, March 11 - 13, Report 6/98-I, Institut für angewandte Mathematik und Informatik, University Münster, pp. 31 - 36 (in German)
1997
Rittgen, Peter: Process Theory of Scheduling - Algebraic Modeling of Processes, Resource Constraints and Time, dissertation, Department of Economics and Business Administration, University of Frankfurt, 1997 (in German)
Prasse, Michael; Rittgen, Peter: Remarks on Peter Wegner’s Tracts on Interaction and Computability, Working paper 5, IS Institute (IWI), University Koblenz-Landau (in German)
Prasse, Michael; Rittgen, Peter: Why Church's Thesis Still Holds - Some Notes on Peter Wegner's Tracts on Interaction and Computability, Working paper 8, IS Institute (IWI), University Koblenz-Landau
1996
Wendt, Oliver; Rittgen, Peter: Algebraic Specification of Timed Production Processes, Working paper, Reference No. 1996-1, IS Institute (IWI), Frankfurt University
Wendt, Oliver; Rittgen, Peter; König, Wolfgang: Solving Decision Problems by Distributed Decomposition and Delegation - Foundations of a Theory and Its Application within a Normative Group Decision Support System Framework, in: König, Wolfgang; Kurbel, Karl; Mertens, Peter; Preßmar, Dieter (eds): Distributed Information Systems in Business, Springer, Heidelberg, 1996, pp. 55 - 72
1995
Rittgen, Peter; Wendt, Oliver; König, Wolfgang: Probabilistic Reasoning about Vagueness, WIRTSCHAFTSINFORMATIK, 37 (1995) 2, pp. 139 - 148 (in German)
Rittgen, Peter; Wendt, Oliver: Algebraic Specification of Resource-Constrained Processes, Working paper, Reference No. 1995-9, IS Institute (IWI), Frankfurt University
1994
Rumpf, Marcus-Julian; Pfau, Hans-Heiken; Wendt, Oliver; Rittgen, Peter: Coordination of Distributed Planning and Problem Solving, Working paper, Reference No. 1994-12, IS Institute (IWI), Frankfurt University
Wendt, Oliver; Rittgen, Peter; König, Wolfgang: Solving Decision Problems by Distributed Decomposition and Delegation, Working paper, Reference No. 1994-29, IS Institute (IWI), Frankfurt University
König, Wolfgang; Wendt, Oliver; Rittgen, Peter: The IS Research Program "Distributed Information Systems in Business" of the German Research Society, WIRTSCHAFTSINFORMATIK, 36 (1994) 5, pp. 488 - 501 (in German)
1993
Rittgen, Peter; Wendt, Oliver; König, Wolfgang: Probabilistic Reasoning about Vagueness, Working paper, Reference No. 1993-3, IS Institute (IWI), Frankfurt University
Wendt, Oliver; Rittgen, Peter: ANDORI graphs - an extension of AND/OR graphs for distributed problem solving and reasoning, Working paper, Reference No. 1993-9, IS Institute (IWI), Frankfurt University
1992
Wendt, Oliver; Rittgen, Peter; König, Wolfgang: Solution Space-oriented Decomposition of Complex Systems as an Approach to Distributed Problem Solving, Working paper, Reference No. 1992-5, IS Institute (IWI), Frankfurt University (in German)
Rittgen, Peter; Wendt, Oliver; König, Wolfgang: Probabilistic Reasoning about Vagueness - Integrating Vagueness and Uncertainty within the Bayesian Model, Working paper, Reference No. 1992-4, IS Institute (IWI), Frankfurt University (in German)
Rittgen, Peter; Wendt, Oliver: Integrating Action Alternatives and Criteria in a Distributed Decision Support System, Working paper, Reference No. 1992-7, IS Institute (IWI), Frankfurt University (in German)
Rittgen, Peter; Wendt, Oliver: Some Approaches to Distributed Decision Making in a Decision Support System Framework, Working paper, Reference No. 1993-25, IS Institute (IWI), Frankfurt University (in German)