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Related Experiment Videos

Consistent benefits for the system designer and the end-user.

P Briggs1

  • 1Department of Psychology, City of London Polytechnic, UK.

Applied Ergonomics
|September 1, 1989
PubMed
Summary

Command wheels, a novel diagrammatic tool, simplify understanding command language consistency. This method accurately predicts user performance and command recall, offering an alternative to complex formal grammars.

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Area of Science:

  • Human-Computer Interaction
  • Cognitive Psychology
  • Software Engineering

Background:

  • Command language consistency is crucial for user learnability and reducing complexity.
  • Formal grammars are traditionally used to define and measure command language consistency.
  • Existing methods may be overly rigorous and less adaptable to design flexibility.

Purpose of the Study:

  • To introduce a diagrammatic meta-language, the 'command wheel', for illustrating command set consistency.
  • To evaluate the effectiveness of command wheels as a tool for analyzing user complexity.
  • To compare the utility of command wheels against formal grammar specifications.

Main Methods:

  • Development and description of the 'command wheel' diagrammatic tool.
  • Application of command wheels to analyze the consistency of a command set.
  • Empirical study involving word-processor users to assess prediction accuracy.
  • Measurement of user on-line performance and command recall.

Main Results:

  • Command wheels provide a simple and flexible method for visualizing command language properties.
  • The study demonstrated that command wheel properties accurately predicted user behavior.
  • Effective prediction was observed for both real-time task performance and long-term command memory.

Conclusions:

  • Command wheels offer a practical and effective alternative to formal grammars for assessing command language consistency.
  • This diagrammatic approach enhances the design process by allowing greater flexibility.
  • Command wheels have significant implications for improving user interface design and training.

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