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The planning fallacy is systematically underestimating how long tasks will take and how much they'll cost — even after the exact same thing burned you before. Examples:
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5 examples of the planning fallacy
'It'll take a weekend' renovations ...that quietly run for months.
Software ship dates Teams confidently set a date, then miss it by half again — every release.
The 20-minute errand ...that somehow swallows your whole morning.
Big public projects Bridges, stadiums, and railways routinely land years late and billions over budget.
'I'll start early' The essay, the taxes, the report — begun late and finished at the deadline, despite last year's identical scramble.
How to spot it in yourself
When estimating, ask 'how long did this kind of thing actually take last time?' and start there, not from a fresh best-case.
Take your honest estimate and add 50% (more for anything you haven't done before) — you'll resist the buffer and you'll need it.
Track estimate vs. actual a few times; the ratio is your personal optimism multiplier to apply going forward.
Go deeper — get the full book
Loved these examples? Listen to Thinking, Fast and Slow by Daniel Kahneman free with an Audible trial — or read it in full.
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