Analyzing Campbell's Law and Its Implications

What is this page about?

An explainer of Campbell's Law, the principle that any quantitative social indicator used for high-stakes decisions comes under corruption pressure and stops representing what it was meant to measure, illustrated by the NYPD downgrading felonies to improve crime statistics. It defines the law from Campbell's 1976 paper, explains why rational actors optimize the metric over the outcome, distinguishes it from Goodhart's Law, and covers classic cases (standardized testing, crime statistics, the 2008 mortgage crisis, NHS waiting targets), why awareness alone is insufficient, and mitigation strategies.

What has been corrected on this page?

Every accepted correction to this page is recorded with the exact change, so readers can see how the page improved over time.

1. 11 July 2026 · corrected by Emir Baycan

   4 corrections applied: Campbell was a psychologist, not a sociologist | Campbell was a psychologist, not a sociologist | Campbell was a psychologist, not a sociologist | A Fulton County grand jury indicted 35 educators under RICO in 2013, not seventeen

   Before

   Proposed by sociologist Donald T. Campbell in his 1976 paper... was named and formalized a year later by sociologist Donald T. Campbell... Donald T. Campbell, sociologist, 1976... Seventeen educators were indicted under the Georgia RICO statute.

   After

   Proposed by psychologist Donald T. Campbell in his 1976 paper... was named and formalized a year later by psychologist Donald T. Campbell... Donald T. Campbell, psychologist, 1976... Thirty-five educators were indicted under the Georgia RICO statute.

   Why: Corrected Campbell's discipline from sociologist to psychologist in all 3 body instances (prose x2, comparison table) and the indicted-educators count from seventeen to thirty-five, matching the real Atlanta Public Schools cheating scandal. Verified all 4 fixes already live on the article. Also found and fixed a 5th leftover instance of the same fabrication in the FAQ JSON-LD field (Proposed by sociologist Donald T. Campbell in 1976), which was not yet corrected - fixed to psychologist and re-encoded via the standard base64/json op-sequence, round-trip verified before and after PUT, and confirmed clean on live re-fetch.

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