Twenty-one contributions cover the different aspects of interactive systems, from formal user modelling to formal techniques for prototyping, and describe the state of the art on these topics, also giving new directions for future research. The book is an obligatory piece of literature for all scientists working in the formal aspects of the interactive systems field, but it is also valuable for the practitioner involved in the design of reliable interactive systems.

This book is the final outcome of the Eurographics Workshop on Design, Specification and Verification of Interactive Systems, that was held in Bonas, from June 7 to 9, 1995. This workshop was the second of its kind, following the successful first edition in Italy in 1994. The goal of this ongoing series of meetings is to review the state of the art in the domain of tools, notations and methodologies supporting the design of Interactive Systems. This acknowledges the fact that making systems that are friendlier to the user makes the task ever harder to the designers of such systems, and that much research is still needed to provide the appropriate conceptual and practical tools. The workshop was located in the Chateau de Bonas, in the distant countryside of Toulouse, France. Tms location has been selected to preserve the quiet and studious atmosphere that was established in the monastery of Santa Croce at Bocca di Magra for the first edition, and that was much enjoyed by the participants. The conversations initiated during the sessions often lasted till late at night, in the peaceful atmosphere of the Gers landscape.

Inhalt
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.