Please see the following link for further explanations on Rossi's metallic laws of evaluation.

https://www.gwern.net/docs/sociology/1987-rossi

https://www.cgdev.org/blog/rossis-rules

The Iron Law of Evaluation: The expected value of any net impact assessment of any large-scale social program is zero.

There is also the Stainless Steel Law, the Brass Law and the Zinc Law.

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