# The Planning Fallacy

> Source: https://ollybritton.com/notes/rationality/concepts/the-planning-fallacy/ · Updated: 2020-12-28 · Tags: notes

##### What is the Planning Fallacy??
The tendency to underestimate the amount of time it will take to complete a task.

##### Why does the Planning Fallacy occur??
We tend to be over optimistic and think that things will go exactly to plan.

##### What is the "inside view" for the Planning Fallacy??
Visualising a task by thinking of the steps form the beginning to a successful conclusion.

##### What is the "outside view" for the Planning Fallacy??
Comparing a task to broadly similar tasks in the past.

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