The Role of a User’s System Model, and its Relevance to User Interface Management

  • M. Apperley
  • R. Spence
Part of the Eurographic Seminars book series (FOCUS COMPUTER)


Of the major attributes of an interactive computer system — examples of which range from cash dispensers to engineering design workstations — the command dialogue is recognized as being particularly vital. A good command dialogue is not only easily learned, but is then essentially instinctive to the user, so that conscious thought can be directed instead to the real problem at hand. In contrast, a poor command language is difficult to learn, intrudes — by reason of the need for conscious thought — upon the main task, and may well be unsympathetic in the sense that command errors will often have catastrophic consequences.


Menu Item Conscious Thought Parameter Node Selective Retreat Command Language 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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  1. Spence R, Apperley M D (1977) The interactive-graphic man-computer dialogue in computer-aided circuit design. Transactions IEEE on Circuits and Systems CAS-24: 49–61.CrossRefGoogle Scholar
  2. Spence R, Apperley M D (1983) Hierarchical Dialogue Structures in Interactive Computer Systems. Software-Practice and Experience 13:777–790CrossRefGoogle Scholar

Copyright information

© EUROGRAPHICS The European Association for Computer Graphics 1985

Authors and Affiliations

  • M. Apperley
    • 1
  • R. Spence
    • 2
  1. 1.University of WaikatoNew Zealand
  2. 2.Imperial CollegeLondonUK

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