No. 341 · Fixing problems · Human Nature and Judgement
Broken Windows Theory
Small signs of neglect tell people that nobody cares, and invite bigger trouble.
In the Almanac
“Zimbardo’s abandoned cars”, 1969 · “New York’s subway”, 1984–1989
Both stories in full, three ways to use it and where it misleads.
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Questions
What is Broken Windows Theory?
Broken Windows Theory says small, visible disorder sends a message that nobody is watching, which lowers restraint and invites bigger problems. In 1969, a damaged car drew vandals fast, and New York's subway beat graffiti by never letting a tagged car run.
How do you use Broken Windows Theory?
Use it by fixing the first small crack quickly: the first dirty mug, the first late meeting, the first skipped habit. Focus on maintenance and care rather than harsh punishment, because the strongest lesson is that what we tolerate becomes the standard.
When does Broken Windows Theory matter?
Broken Windows Theory is one of the 40 mental models for fixing problems, the situations where you ask: Why does this keep going wrong, and how do I fix it for good? Within that, it belongs to “How problems spread”, alongside Chain Reaction, Containment and Critical Mass.
What is an example of Broken Windows Theory?
Two stories show it at work: Zimbardo’s abandoned cars (1969) and New York’s subway (1984–1989). 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 Broken Windows Theory?
Social Proof, Entropy and Tyranny of Small Decisions. Broken Windows Theory itself comes from human nature and judgement.