If you don't want to be late, enumerate: Unpacking reduces the planning fallacy

  • Kruger J
  • Evans M
  • 134

    Readers

    Mendeley users who have this article in their library.
  • 80

    Citations

    Citations of this article.

Abstract

People tend to underestimate how long it will take to complete tasks. We suggest that one reason people commit this planning fallacy is that they do not naturally "unpack" multifaceted tasks (e.g., writing a manuscript) into subcomponents (completing the literature review, general discussion, references section, etc.) when making predictions. We tested this interpretation by asking participants to estimate how long it would take them to complete one of several tasks: holiday shopping in Experiment 1, "getting ready" for a date in Experiment 2, formatting a document in Experiments 3 and 5, and preparing food in Experiment 4. Participants prompted to unpack the task provided longer- and, in Experiments 3 4, less biased-estimates of how long the task would take than did participants who did not. Experiment 5 showed that the debiasing influence of unpacking is moderated by task complexity: the more multifaceted the task, the greater the influence of unpacking. © 2003 Elsevier Inc. All rights reserved.

Author-supplied keywords

  • Decomposition
  • Forecasting
  • Heuristics and biases
  • Overconfidence
  • Planning fallacy
  • Support theory
  • Unpacking

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Find this document

Authors

  • Justin Kruger

  • Matt Evans

Cite this document

Choose a citation style from the tabs below

Save time finding and organizing research with Mendeley

Sign up for free