Broken Window Theory

In the mid-1990s, police in New York started a ‘quality of life campaign’, designed to combat minor criminality. Graffiti and the traces of vandalism were removed and street refuse was cleaned up, all from the idea that a disorganized environment would encourage bad behavior. And it was a success – the figures for minor criminality dropped. However, there was no theoretical foundation or proof for the idea, also known as the Broken Window Theory.

This theoretical foundation and the proof has now been supplied by three researchers from the University of Groningen. The research is published this week in the scientific magazine Science. In a series of six experiments, they show that the degree to which norms and rules influence behavior varies per environment. This fits in with the sociological ‘Goal-framing theory’, which predicts that people are much less inclined to keep to norms and rules if the environment shows that others are breaking norms or rules. The research sends a clear message to policymakers, state the researchers: clean up the streets, remove graffiti and ensure that an environment demonstrates that norms and rules are being followed.

The negative effect of signs of norm-breaking behaviour has been revealed by experiments conducted by Kees Keizer, Prof. Siegwart Lindenberg and Dr Linda Steg, all members of the Faculty of Behavioral and Social Sciences. The first experiment compared a situation where a wall in an alley was covered with graffiti with one where the wall was completely clean. In both cases a No Graffiti sign was hung on the wall. One afternoon an advertisement folder was attached to the handlebars of the bikes parked in the alley. In the situation with the graffiti-covered wall, 69 percent of the cyclists threw the folder onto the ground; this was only 33 percent with a clean wall.

That the negative effects of such an environment can also encourage more serious offenses such as stealing was revealed by an experiment with an envelope hanging half out of a letterbox. The window on the envelope clearly revealed that there was a five euro note inside. If there was graffiti on or around the letterbox, 27 percent of passers-by took the money, with no graffiti only 13 percent did so.

University of Groningen, RUG, November 21, 2008
More information: Kees Keizer

One Response to “Broken Window Theory”

  1. Arne Says:

    In the Book ‘the Tipping point’ from Malcolm Gladwell, is written about an example of NY city fighting the criminality based on the same theory..

    Real nice to read..

    (Thanks to someone from NL!!, the book was a Christmas gift)


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