HCI in Italy Reasoning on Gestural Interfaces through Syndetic Modelling G.P. Faconti Introduction Recent advances in user interface development have been mainly driven by technical innovation, based either on new interaction devices and paradigms, or on algorithms for achieving realistic audio/visual effects [Connor92] [Robertson91 a] [Robertson9 lb] [Berners92]. In such a rich environment, the user potentially interacts with the computer by addressing concurrently different modalities. While the technology driven approach has made possible the implementation of systems in specific application areas, it largely misses an undelying theory. This makes it difficult to assess whether this technology will be effective for users with the consequence that cognitive ergonomics is becoming an urgent requirement for the design of new interactive systems. Attention has been paid to the psychology of terminal users from the very beginning of humancomputer interface research [Martin73]. However, existing established design techniques do not readily accomodate issues such as concurrency and parallelism, or the potential for the interaction with multiple interface techniques [Coutaz93]. Recently, works have taken place investigating models and techniques for the analysis and design of interactionally rich systems from a variety of disciplinary perspectives as it can be found in the DSV-IS book series
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