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Related Experiment Videos

Evaluation of three methodologies for assessing work activity during computer use.

Michelle M Homan1, Thomas J Armstrong

  • 1Environmental Science and Engineering, Gannon University, 109 University Square, PMB 3663, Erie, PA 16541, USA. homan@gannon.edu

AIHA Journal : a Journal for the Science of Occupational and Environmental Health and Safety
|February 7, 2003
PubMed
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Worker self-reports overestimate computer use, particularly keyboard and mouse activity. For accurate exposure data in studies, activity monitoring or work sampling are more reliable than self-reporting.

Area of Science:

  • Occupational Health
  • Human-Computer Interaction
  • Ergonomics

Background:

  • Accurate measurement of computer use is crucial for occupational health research.
  • Previous methods for assessing computer-related tasks have limitations.

Purpose of the Study:

  • To compare the accuracy of worker self-report, work sampling, and activity monitoring for gathering computer use data.
  • To evaluate methodologies for measuring keying time, mouse usage, and task duration.

Main Methods:

  • A repeated measures design with 51 computer users over three workdays.
  • Simultaneous data collection using self-report, work sampling, and activity monitoring.
  • Measurement of keyboard time, mouse usage, and task performance.

Related Experiment Videos

Main Results:

  • Worker self-reports significantly overestimated actual keyboard and mouse usage.
  • Self-reported data showed greater variance compared to objective measures.
  • Overestimation factors ranged from 1.5 to 4 for keyboard use, and twofold for mouse usage.

Conclusions:

  • Worker self-reporting is an inaccurate method for quantifying keying and mouse usage.
  • Work sampling and activity monitoring are more suitable for obtaining reliable exposure data in epidemiological studies.