This book constitutes the refereed proceedings of the 31st International Conference on Conceptual Modeling, ER 2012, held in Florence, Italy, in October 2012. The 24 regular papers presented together with 13 short papers, 6 poster papers and 3 keynotes were carefully reviewed and selected from 141 submissions. The papers are organized in topical sections on understandability and cognitive approaches; conceptual modeling for datawarehousing and business intelligence; extraction, discovery and clustering; search and documents; data and process modeling; ontology based approaches; variability and evolution; adaptation, preferences and query refinement; queries, matching and topic search; and conceptual modeling in action.

This book constitutes the refereed proceedings of the 25th International Conference on Conceptual Modeling, ER 2006, held in Tucson, AZ, USA in November 2006. The 37 revised full papers presented together with two keynote talks, two panel session papers, six industrial papers, and five demo/posters papers were carefully reviewed and selected from 158 submissions.

I would like to welcome you to Singapore and the 17th International Conf- enceonConceptualModeling(ER 98).Thisconferenceprovidesaninternational forum for technical discussion on conceptual modeling of information systems among researchers, developers and users. This is the ?rst time that this c- ference is held in Asia, and Singapore is a very exciting place to host ER 98. We hope that you will ?nd the technical program and workshops useful and stimulating. The technical program of the conference was selected by the distinguished program committee consisting of two co-chairs and 83 members. Credit for the excellent?nalprogramisduetoTokWangLingandSudhaRam.Specialthanks to Frederick H. Lochovsky for selecting interesting panels, and Alain Pirotte for preparation of attractive tutorials. I would also like to thank Yong Meng Teo (PublicityChair), andtheregionco-ordinators, AlbertoLaender, ErichNeuhold, Shiwei Tang, and Masaaki Tsubaki, for taking care of publicity. The following three workshops are also organized to discuss speci?c t- ics of data modeling and databases: International Workshop on Data Wa- housing and Data Mining organized by Sham Navathe (Workshop chair) and MukeshMohania(ProgramCommitteeChair), InternationalWorkshoponNew Database Technologies for Collaborative Work Support and Spatio-Temporal DataManagement organizedbyYoshifumiMasunaga, and InternationalWo- shop on Mobile Data Access organized by Dik L. Lee. Ee Peng Lim took care of all detailed work related to the workshops. I would like to thank all these people who organized the workshops as well as the members of program committees. The workshop proceedings will be published jointly after the workshop."

This book constitutes the refereed proceedings of five workshops symposia, held at the 39th International Conference on Conceptual Modeling, ER 2020, which were supposed to be held in Vienna, Austria, in November 2020, but were held virtually due to the COVID-19 pandemic instead.The 20 papers promote and disseminate research on theories of concepts underlying conceptual modeling, methods and tools for developing and communicating conceptual models, techniques for transforming conceptual models into effective implementations, and the impact of conceptual modeling techniques on databases, business strategies and information systems. The following workshops are included in this volume: First Workshop on Conceptual Modeling Meets Artificial Intelligence and Data-Driven Decision Making (CMAI); First International Workshop on Conceptual Modeling for Life Sciences (CMLS); Second Workshop on Conceptual Modeling, Ontologies and (Meta)data Management for Findable, Accessible, Interoperable and Reusable (FAIR) Data (CMOMM4FAIR); First Workshop on Conceptual Modeling for NoSQL Data Stores (CoMoNoS); and Third International Workshop on Empirical Methods in Conceptual Modeling (EmpER).

This book constitutes the refereed proceedings of the 8th International Conference on Design Science Research in Information Systems and Technology, DESRIST 2013, held in Helsinki, Finland, in June 2013. The 24 full papers, 8 research-in-progress papers, 12 short papers, and 8 poster abstracts were carefully reviewed and selected from 93 submissions. The papers are organized in topical sections on system integration and design; meta issues; business process management and ERP; theory development; emerging themes; green IS and service management; method engineering; papers describing products and prototypes; and work-in-progress papers.