The Object Flow Model: A formal framework for describing the dynamic construction, destruction and interaction of complex objects -- On complex objects and versioning in complex environments -- Application and system prototyping via an extensible object-oriented environment -- Reflection in a uniform behavioral object model -- Relative constraints in ER data models -- Design and implementation of derived entities -- Searching for compositions in ER schemes -- Enhancing the quality of conceptual database specifications through validation -- Functional dependencies generalized for temporal databases that include object-identity -- Temporal extensions to a uniform behavioral object model -- TOOSQL- a temporal object-oriented query language -- A taxonomy for schema versioning based on the relational and Entity Relationship Models -- Neighborhood/conceptual query answering with imprecise/incomplete data -- The entity-relationship model for multilevel security -- HDM2: Extending the E-R approach to hypermedia application design -- Database schema design: A perspective from natural language techniques to validation and view integration -- Transformation of requirement specifications expressed in natural language into an EER model -- A commonsense reasoning facility based on the entity-relationship model -- DETERM: Deterministic Event-Tuned Entity-Relationship Modeling -- A semantic comparison of the modelling capabilities of the ER and NIAM models -- From entity-relationship models to role-attribute models -- Analysis of binary relationships within ternary relationships in ER modeling -- Using conceptual graph theory to support schema integration -- Integration of heterogeneous object schemas -- The role of meta models in federating system modelling techniques -- Multilevel schema integration -- Reuse of object-oriented requirement specifications -- Performance evaluation of reverse engineering relational databases into extended Entity-Relationship models -- Transformation-based database reverse engineering -- Integrating the ER approach in an OO environment -- An extended entity-relationship approach to data management in object-oriented systems -- On mapping ER and relational models into OO schemas -- A repository meta model for interactive systems -- ER-based Information Retrieval in a mixed database environment -- A framework for automatic clustering of semantic models -- Extending ER model clustering by relationship clustering -- Semantic interoperability of multitemporal relational databases -- Modeling time: Adequacy of three distinct time concepts for temporal databases -- Towards a unifying logic formalism for semantic data models -- Knowledge-based approach for abstracting hierarchical and network schema semantics -- A state-space approach for database redesign.

This volume contains the proceedings of the 12th International Conference of the Entity-Relationship Approach, held in Arlington, Texas in December 1993; it contains the revised versions of 42 papers selected for presentation at the conference from a total of 87 submissions. The volume presents many of the most important results on the ERA published since the predecessor conference ER '92. It is organized in sections on object-oriented models, query languages, applications of the ER model, knowledge-based modeling, data modeling, schema integration, reuse and reengineering, integrating ER and object-orientation, conceptual clustering, modeling time and data semantics.