This book constitutes the refereed proceedings of the 27th International Conference on Conceptual Modeling, ER 2008, held in Barcelona, Spain, in October 2008.

Keynotes.- Conceptual Modeling Meets the Human Genome.- Relationship Web: Spinning the Web from Trailblazing to Semantic Analytics.- PIM Meets Web 2.0.- Novel Semantics.- Developing Preference Band Model to Manage Collective Preferences.- A Conceptual Modeling Framework for Expressing Observational Data Semantics.- Towards a Compositional Semantic Account of Data Quality Attributes.- Ontology.- A Formal Model of Fuzzy Ontology with Property Hierarchy and Object Membership.- What's in a Relationship: An Ontological Analysis.- An Upper Level Ontological Model for Engineering Design Performance Domain.- Patterns.- A Multi-level Methodology for Developing UML Sequence Diagrams.- Content Ontology Design Patterns as Practical Building Blocks for Web Ontologies.- Quality Patterns for Conceptual Modelling.- Privacy, Compliance, Location.- Automating the Extraction of Rights and Obligations for Regulatory Compliance.- Location-Based Software Modeling and Analysis: Tropos-Based Approach.- Risk Evaluation for Personal Identity Management Based on Privacy Attribute Ontology.- Process mgt and Design.- Beyond Control-Flow: Extending Business Process Configuration to Roles and Objects.- Value-Driven Coordination Process Design Using Physical Delivery Models.- Relaxed Compliance Notions in Adaptive Process Management Systems.- Process Models.- On Measuring Process Model Similarity Based on High-Level Change Operations.- Recommendation Based Process Modeling Support: Method and User Experience.- On the Formal Semantics of Change Patterns in Process-Aware Information Systems.- Queries.- Modeling and Querying E-Commerce Data in Hybrid Relational-XML DBMSs.- Approximate Probabilistic Query Answering over Inconsistent Databases.- Conjunctive Query Containment under Access Limitations.-Similarity and Coherence.- Automatic Extraction of Structurally Coherent Mini-Taxonomies.- Analysis and Reuse of Plots Using Similarity and Analogy.- Discovering Semantically Similar Associations (SeSA) for Complex Mappings between Conceptual Models.- Space and Time.- An Adverbial Approach for the Formal Specification of Topological Constraints Involving Regions with Broad Boundaries.- Capturing Temporal Constraints in Temporal ER Models.- Temporal Constraints in Non-temporal Data Modelling Languages.- System Design.- Integrated Model-Driven Development of Goal-Oriented Data Warehouses and Data Marts.- Design Metrics for Data Warehouse Evolution.- A Domain Engineering Approach for Situational Method Engineering.- Translation, Transformation, and Search.- Retune: Retrieving and Materializing Tuple Units for Effective Keyword Search over Relational Databases.- Model Driven Specification of Ontology Translations.- Dealing with Usability in Model Transformation Technologies.- Demo.- Ontology Coordination: The iCoord Project Demonstration.- Designing Similarity Measures for XML.- SESQ: A Model-Driven Method for Building Object Level Vertical Search Engines.- HealthSense: An Application for Querying Raw Sensor Data.- Visual SQL: Towards ER-Based Object-Relational Database Querying.- SAMSTAR: An Automatic Tool for Generating Star Schemas from an Entity-Relationship Diagram.- Constraint-Aware XSLT Evaluation.- A Quality Circle Tool for Software Models.- Generating and Optimizing Graphical User Interfaces for Semantic Service Compositions.- REMM-Studio?+?: Modeling Variability to Enable Requirements Reuse.- A Conceptual-Model-Based Computational Alembic for a Web of Knowledge.- MDBE: Automatic Multidimensional Modeling.- Oryx - Sharing Conceptual Models on the Web.-Providing Top-K Alternative Schema Matchings with .- Role and Request Based Conceptual Modeling - A Methodology and a CASE Tool.- AutoMed Model Management.- QUINST: A Metamodeling Tool.- An Implementation of a Query Language with Generalized Quantifiers.