The Outside View
Updated 2026-08-15
INTRODUCTION
English translation pending.
CORE DEFINITION
The outside view, proposed by Kahneman and Lovallo, says to step out of the unique details of the current case, treat it as one member of a class, and judge it by that class's statistical base rates. When you are lost in the story that this time is different, the discipline is to force the question: what kind of thing is this, and what is the average outcome for that kind?
SCAFFOLDING EFFECT
Reduce cognitive load
- Name the reference class: decide what category of project this actually is, in advance. - Pull the base rate: look up the distribution of outcomes for that class before your own estimate. - Adjust last: start from the base rate and only then nudge for this case's specifics.
Anchor fast decisions
The inside view builds its estimate from the details of this case, and every case believes itself above average, so the estimate drifts optimistic without any check. The reference class drags the estimate back to the distribution that cases like this actually produce, which is why anchoring on it corrects the planning fallacy.
MINIMUM ACTION
In progress 0/1Practice this model in one real situation:
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Source support: Explicit
- en.wikipedia.orghttps://en.wikipedia.org/wiki/Reference_class_forecastingverified
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