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Related Experiment Videos

The evaluation gap in performance perceptions: illusory perceptions of groups and individuals

F J Jourden1, C Heath

  • 1College of Business Administration, University of Illinois, USA.

The Journal of Applied Psychology
|August 1, 1996
PubMed
Summary

Individuals often underestimate their performance, ranking below average. However, groups tend to overestimate their collective performance, ranking above average, a finding that challenges existing bias theories.

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Area of Science:

  • Psychology
  • Social Psychology
  • Cognitive Bias

Background:

  • Individuals commonly exhibit a negative performance illusion, rating themselves below the median after task completion.
  • Group members frequently display a positive performance illusion, rating their collective performance above the median.

Purpose of the Study:

  • To investigate systematic performance illusions in both individual and group settings.
  • To examine the discrepancy between individual and group self-evaluations.

Main Methods:

  • Conducted four laboratory studies involving task performance and subsequent self- and group-rankings.
  • Analyzed the reported performance ranks against a median benchmark.

Main Results:

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  • A consistent negative performance illusion was observed in individuals across all studies.
  • A consistent positive performance illusion was observed in group members across all studies.
  • A significant evaluation gap emerged, with group members rating their group performance higher than individuals rated their own.

    • Conclusions:

    • Group biases do not simply mirror individual biases, suggesting distinct psychological mechanisms at play.
    • The observed evaluation gap challenges theories that assume a direct extension of individual biases to group contexts.
    • Findings highlight the unique nature of social comparison and self-perception within group dynamics.