Cognitive Bias

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Biggest impact on large infrastructure projects, especially when dealing with estimation of costs and benefits.

This topic is related to Complexity, Stakeholder Management, Heuristics, Front-end management (?)

Description & Purpose

Overview of Different Types

The following list of cognitive biases and heuristics is not exhaustive, in reality, there are hundreds of different kinds. The list includes the most commonly encountered instances when dealing with projects as listed by PMI.

  • Optimism Bias - Being overly optimistic, overestimating favorable outcomes and having excessive confidence in the individual's beliefs, knowledge, and capability.
    • Planning Fallacy - Unconsciously underestimating time, cost, and risk.
    • Wishful Thinking - Believing something is true due to a desire or wish.
    • Confirmation Bias - Focussing on information that confirms what you already believe or assume to be true.
    • Overconfidence - Being overly optimistic about an initial assessment and therefore making fast and intuitive decisions rather than deliberate.
  • Loss Aversion - Being more afraid of losses than wanting to acquire gains.
    • Status Quo Bias - Preference for keeping things as they are, change considered as a loss.
    • Anchoring - Sticking with the initial reference point, adjusting it to reach estimate rather than realizing it has become irrelevant.
    • Ostrich Effect - Avoiding risk, failure or difficult situations missing out on important lesson leading to repetition of mistakes.
  • Framing Effect - Using an approach or description that is too narrow.
  • Hindsight Bias - Misremembering predictions, seeing past events as more predictable than they were before they were executed.
  • Confirmation Bias - Tendency to favour information that confirm existing beliefs.
  • Strategic Misrepresentation - Planned, systematic distortion of facts e.g. benefits or costs, to increase chances of project approval.
  • Groupthink - A groups desire to achieve coherence and harmony will cause inadequate decision making, has severe consequences, especially for environments of frequent change.

Optimism Bias

Strategic Misrepresentation


To reduce the impact of cognitive bias in a program or project it is of paramount importance to be aware of their existence. Kahneman suggests asking the following three questions to help recognize and manage biases and their effect: FIND KILDE

  1. Is there any suspicion that biases based on self-interest, overconfidence, or attachment to past experiences exist? If such biases exist, it is almost impossible for people to not have these three influence their decisions.
  2. Does groupthink exist? Assess, recognize, and try to expose the biases' effects.
  3. Are there any recognizable perceptions about people's positive or negative attitudes towards the proposed action / change / result?



Flyvbjerg, 2013; (Hofstede, 2010; and Lovallo & Kahneman, 2003

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