Abstract

A notation for describing user interfaces has been developed which offers the benefits of being theoretically well-founded and reasonably formal while at the same time being of practical use in an industrial software design environment. The notation is based on a five-layer model of interface software derived from user interface management system and window management work, and is, essentially, a statetransitional approach to the description of interfaces and their behaviour. A short example of the use of the notation is given and its strengths and weaknesses are discussed.

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