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Goodhart’s Law: When a measure becomes a target, it ceases to be a good measure


Goodhart’s Law is a concept introduced by economist Charles Goodhart in the 1970s. It states that when a measure becomes a target, it ceases to be a good measure. In simpler terms, this means that using a metric as a goal can lead to unintended consequences and distortions in behavior. Chasing the metric becomes the goal rather than achieving the overall outcome.

Why Goodhart’s Law Matters

Goodhart’s Law is relevant to several areas of life, including business and politics. For example, if a company sets a sales target for its employees, they may focus solely on achieving that target, even if it means sacrificing quality or customer satisfaction. Similarly, if a government sets a target for reducing crime rates, police officers may be incentivized to focus on low-level offenses instead of tackling more serious crimes.

The Risks of Misusing Metrics

One of the key risks associated with Goodhart’s Law is that it can lead to a narrow focus on a specific metric, at the expense of other important factors. This can result in unintended consequences that can be harmful to individuals or organizations. For example, a school that focuses on improving test scores may neglect other aspects of education, such as critical thinking or creativity.

Avoiding the Pitfalls of Metrics

To avoid the pitfalls of Goodhart’s Law, it’s important to use metrics as a tool for measuring progress, rather than as a target in and of themselves. This means setting goals and targets that are aligned with broader objectives, and using metrics to track progress towards those goals. It also means being mindful of the unintended consequences that can arise from focusing too narrowly on a specific metric.


In conclusion, Goodhart’s Law is a reminder that using metrics as targets can have unintended consequences. While metrics can be useful tools for measuring progress, they should be used in conjunction with a broader set of objectives, and with an awareness of the risks associated with narrow focus. By keeping these principles in mind, we can avoid the pitfalls of Goodhart’s Law, and use metrics in a way that promotes positive outcomes for individuals and organizations alike.

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Dinker Charak

Dinker has over a decade of experience in building products across diverse domains such as Industrial Automation, Home Automation, Operating Systems, High Energy Particle Physics, Embedded Systems, Online Video Advertising, Messaging, K-12 education and Private Banking. He also founded Gungroo Software. He books '#ProMa: Product Management Tools, Methods & Some Off-the-wall Ideas' and 'The Neutrinos Are Coming and Other Stories' are available globally. He also manages, an Indian Sci-fi portal.