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Related Experiment Videos

Enhancing the usability of a task analysis method: a notation and environment for requirements specification

T C Ormerod1, J Richardson, A Shepherd

  • 1Department of Psychology, Lancaster University, UK.

Ergonomics
|November 20, 1998
PubMed
Summary

Ergonomic redesign of notations for the Sub-Goal Template (SGT) method improved task analysis. A conditional notation and computer tool enhanced performance and accuracy in specifying operator task sequences.

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Area of Science:

  • Human-Computer Interaction
  • Cognitive Ergonomics
  • Task Analysis

Background:

  • The Sub-Goal Template (SGT) method is a task-analytic approach for specifying information requirements.
  • Effective notation is crucial for accurately describing complex operator tasks, especially those involving choices.
  • Existing SGT notations may not be optimally designed for clarity and efficiency.

Purpose of the Study:

  • To ergonomically redesign the notation for contingent sequences within the SGT method.
  • To compare the performance of a new conditional notation against the original disjunctive notation.
  • To evaluate a computer-based tool for SGT method task plan specification against a paper-based method.

Main Methods:

  • Two experiments were conducted to compare different notations and tools for task analysis.

Related Experiment Videos

  • Experiment 1: Compared a disjunctive notation (Either...or...) with a conditional notation (If...then...if not...) for redescribing task sequences.
  • Experiment 2: Compared a computer-based SGT environment with a paper-based equivalent for specifying task plans.

    • Main Results:

    • The conditional notation generally led to better performance than the disjunctive notation for simple and moderately complex task plans.
    • No significant performance difference was observed for the most complex task plans.
    • The computer environment was easier to use and resulted in greater accuracy for task plan redescription, despite being slower.

    Conclusions:

    • Ergonomic design is essential for developing effective notations and tools for task analysis methods like SGT.
    • The redesigned conditional notation and computer-based tool show promise for improving task analysis accuracy and usability.
    • Further research may be needed to optimize computer-based tools for speed and efficiency in complex task analysis.