The papers presented in this text highlight the contributions of researchers in the field of object oriented technology, theory and practice. Among the topics presented are object-rational data technology, distributed object computing and concepts and methodologies.

Keynote Address.- Object-Oriented Information Systems in the 21st Century.- Object Oriented Methodologies.- Complexity and Maintenance: A Comparative Study of Object-Oriented and Structured Methodologies.- Systems Oriented Analysis and Design Directions: A Suggested Evolution from the Object Model.- Query Processing.- Query Evaluation in an Object-Oriented Multimedia Mediator.- A Concatenated Signature Scheme on Path Dictionary for Query Processing of Composite Objects.- An Approach to Query Translation in a Federation of Distributed Heterogeneous Database Systems.- Modelling Issues I.- A Practical Formally-Based Modelling Method for Object Oriented Information Systems.- Viewpoints in Object-Oriented Databases.- Construction of a Modelling Framework for Health Information.- Transaction Processing and Concurrency Control.- A Performance Evaluation for a Concurrency Control Mechanism in an ODBMS.- A Transaction Model to Support Disconnected Operation in a Mobile Computing Environment.- Legacy Transactional Systems Integration Framework.- Applications.- A Dynamic Business Object Architecture for an Insurance Industrial Project.- Automatic Drawing of Structured Digraphs.- Making O2 become a WWW Server.- Modelling Issues II.- Subject Composition by Roles.- Assessing Inheritance for the Multiple Descendant Redefinition Problem in OO Systems.- An Aggregation Model and its C++ Implementation.- Re-Usability I.- Behavioural Pattern Analysis Approach.- Enhancing Reusability and Maintainability in NDOOM.- Temporal Business Objects: A Waste of Time?.- Modelling Issues III.- Classifying Approaches to Object Oriented Analysis of Work with Activity Theory.- Race Scheduling Controls for Object Systems.- Quality of Service Object-Oriented Modeling at the Operating System Level.- Re-Usability II.- A Descriptive Language for Information Object Reuse through Virtual Documents.- Generic Reusable Business Object Modelling - A Framework and its Application in British Telecommunications plc.- Object-Oriented Approaches to Software Reuse.- Architectural Issues.- Realizing Object-Relational Databases by Mixing Tables with Objects.- CORBA and ODBMSs in Viewpoint Development Environment Architectures.- An Agent-Based Coordination Model on Workflow Databases.- Object Orientation in Spatial Structures.- Inheritance of Multimedia Class having Temporal-Spatial Structures.- Design and Implementation of Object-Oriented Spatial Views.- Two Levels of Spatial Data Modeling for an Object-Oriented Spatial Database System.- Database Design and Views.- Object-Oriented Design of a Database Engine for Multidimensional Discrete Data.- Updating Virtual Complex Objects.- Zohra Bellahsene.- Re-Engineering Relational Normal Forms in an Object-Oriented Framework.- Software Engineering/Development.- A Framework for Component-Oriented Tool Integration.- A Refined Meta-Model Approach to Education for the Transition to Object Technology.- Version-Based Index Management in an Object Database System to Support Software Engineering Applications.- Large Scale Environments.- Disseminating Object-Oriented Applications in Large Scale Environments.- CJava: Introducing Concurrent Objects in Java.- Author Index.