No. 145 · Work · Human Nature and Judgement
Hofstadter’s Law
It always takes longer than you expect, even when you allow for that.
In the Almanac
“The Channel Tunnel”, 1987–1994 · “Berlin Brandenburg Airport”, 2012–2020
Both stories in full, three ways to use it and where it misleads.
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Questions
What is Hofstadter’s Law?
Hofstadter's Law says it always takes longer than you expect, even when you take the law into account. We picture the smooth path and forget the surprises, interruptions and dependencies that pile up.
How do you use Hofstadter’s Law?
To use it, break tasks into small pieces, check how long similar work really took before, add a buffer, and share the later date. Treat your first estimate as a best case, not a forecast.
When does Hofstadter’s Law matter?
Hofstadter’s Law is one of the 43 mental models for work, the situations where you ask: How do I get the right things done? Within that, it belongs to “Finishing, not polishing”, alongside Minimum Viable Product, Mythical Man-Month and Perfect is the Enemy of Good.
What is an example of Hofstadter’s Law?
Two stories show it at work: The Channel Tunnel (1987–1994) and Berlin Brandenburg Airport (2012–2020). Both are told in full in The Mental Models Daily Almanac, which has two stories for each of its 365 models.
Which mental models are related to Hofstadter’s Law?
Non-Response Bias, Mythical Man-Month and Murphy’s Law. Hofstadter’s Law itself comes from human nature and judgement.