Executable specifications for a human-computer interface

  • Authors:
  • Robert J.K. Jacob

  • Affiliations:
  • Naval Research Laboratory, Washington, D.C.

  • Venue:
  • CHI '83 Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
  • Year:
  • 1983

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Abstract

It is useful to be able to specify a proposed human-computer interface formally before building it, particularly if a mockup suitable for testing can be obtained directly from the specification. A specification technique for user interfaces, based on state transition diagrams, is introduced and then demonstrated for a secure message system application. An interpreter that executes the resulting specification is then described. Some problems that arise in specifying a user interface are addressed by particular features of the technique: To reduce the complexity of the developer's task, a user interface is divided into the semantic, syntactic, and lexical levels, and a separate executable specification is provided for each. A process of stepwise refinement of the syntactic specification, leading from an informal specification to an executable one is also presented. Since the state diagram notation is based on a non-deterministic model, constraints necessary to realize the system with a deterministic interpreter are given.