Layered protocols for computer-human dialogue. II: some practical issues
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TL;DR
The concepts of the Layered Protocol reference model of user interaction are developed through consideration of the design process, using a multimodal spatial interaction as an example, and the layered model is considered in the light of published guidelines for user interfaces.
Abstract
The concepts of the Layered Protocol reference model of user interaction are developed through consideration of the design process, using a multimodal spatial interaction as an example. Specific issues are addressed: multiplexing (which is seen as a way of describing interface modes); feedback, with special consideration of voice recognition systems; type-ahead and asynchronous interaction; embedded help and the development of autonomous means for the computer to assist the user; the tension among robustness, modularity, and efficiency; learning and transfer of training; standardization issues; and evaluation of interfaces, with examples from the Apple Macintosh and the Adagio workstation. Finally, the layered model is considered in the light of published guidelines for user interfaces.