{"slug":"goodharts-law","name":"Goodhart's Law","category":"Mental model","definition":"Goodhart's Law: when a metric controls behavior, people optimize the metric rather than the underlying goal. Formulated by economist Charles Goodhart (1975) on UK monetary policy; sharpened by Marilyn Strathern (1997): \"When a measure becomes a target, it ceases to be a good measure.\" Four failure mechanisms (Manheim & Garrabrant 2018): Regressional, Extremal, Causal, Adversarial. Countermeasure is always multi-metric +…","latest_skill_md":"https://raw.githubusercontent.com/deciqAI/knowledge-skills/main/goodharts-law/SKILL.md","playbook_url":"https://www.deciqai.com/skills/goodharts-law?utm_source=skill&utm_medium=json-api&utm_campaign=knowledge-skills&utm_content=goodharts-law","install":"npx skills add deciqAI/knowledge-skills","repo":"https://github.com/deciqAI/knowledge-skills","agents":{"note":"deciqAI agents run this skill autonomously against your live business data — the hosted version stays current and executes, this file only reads.","start_free":"https://www.deciqai.com/?utm_source=skill&utm_medium=json-api&utm_campaign=knowledge-skills&utm_content=goodharts-law"}}