Invited Talks.- Interaction, Cognition and Visualization.- Formal Specification Techniques for Interactive Systems.- Interacting with Information.- User-Side Modeling and Co-Modeling.- A User Interface Evaluation Mapping Physical User Actions to Task-Driven Formal Specifications.- Interaction and Task Requirements.- Revising Mental Models to Accomodate Expectation Failures in Human-Computer Dialogues.- The Application of Petri Nets to Represent and Reason about Human Factors Problems during Accident Analyses.- Requirements for Formal Specification.- Requirements for the Next Generation of User Interface Specification Languages.- Exploring Design Options Rationally.- Moving between Contexts.- Prototyping, Generation and Evaluation.- Combining Formal Techniques and Prototyping in User Interface Construction and Verification.- Modelling and Generation of Graphical User Interfaces in the TADEUS Approach.- Four Different Measures to Quantify Three Usabiliy Attributes: ‘Feedback’, Interface Directness’ and ‘Flexibility‘.- Design and Verification.- Proving the Correctness of Formal User Interface Specifications.- A Software Demonstrator of Modality Theory.- Towards a Systematic Building of Software Architecture: The TRIDENT Methodological Guide.- The Design of Narrative Virtual Environments.- On the Expression of Interaction Properties within an Interactor Model.- Applying a Structured Method for Usability Engineering To Recreational Facilities Booking User Requirements: A Successful Case Study.- A Formal Design for Mutually Composed Multiple Media in Presentations.- Reports from Working Groups.- Role of Verification.- The Challenge of Time.- Working Group Report: User and Task Modeling.- Towards a Taxonomy for Interactive Graphics Systems.