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Related Experiment Videos

Skills, rules and knowledge in aircraft maintenance: errors in context.

Alan Hobbs1, Ann Williamson

  • 1Bureau of Air Safety Investigation, PO Box 967, Civic Square, Canberra ACT 2608, Australia. ahobbs@mail.arc.nasa.gov

Ergonomics
|May 25, 2002
PubMed
Summary
This summary is machine-generated.

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Skill-based performance in aircraft mechanics is more reliable than rule- or knowledge-based performance when accounting for workplace error opportunities. Safety interventions should focus on rule- and knowledge-based tasks to reduce errors.

Area of Science:

  • Human Factors and Ergonomics
  • Cognitive Psychology
  • Industrial Safety

Background:

  • Automatic or skill-based behavior is often presumed more reliable than conscious control.
  • Rasmussen's skill-rule-knowledge framework has identified significant skill-based errors in incident analysis.
  • Workplace error opportunities may inflate the apparent unreliability of skill-based performance.

Purpose of the Study:

  • To investigate the intrinsic reliability of skill-based, rule-based, and knowledge-based performance in aircraft mechanics.
  • To determine if observed skill-based errors are due to intrinsic unreliability or workplace factors.
  • To inform the direction of industrial safety interventions for error reduction.

Main Methods:

  • Analysis of 99 errors reported by 72 aircraft mechanics.

Related Experiment Videos

  • Task analysis based on observations of 25 aircraft mechanics' work.
  • Normalization of error frequencies by identified opportunities for error.

    • Main Results:

    • Skill-based performance demonstrated higher reliability than rule-based performance.
    • Rule-based performance was found to be more reliable than knowledge-based performance.
    • Error rates were significantly influenced by the opportunities for error inherent in the tasks.

    Conclusions:

    • Skill-based performance is intrinsically more reliable than rule- or knowledge-based performance.
    • Workplace design and task allocation significantly impact error rates.
    • Safety interventions should prioritize addressing errors in rule- and knowledge-based performance domains.