Anthropologist Marilyn Strathern summarized Goodhart’s law most succinctly saying, “When a measure becomes a target, it ceases to be a good measure.”
If a measure becomes a target, it creates incentive to hit the target. This perverse incentive leads to behaviors that can be counterproductive.
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Productive engineers should write one pull request per day. One pull request per day creates forward momentum. Forward momentum leads to progress. Progress is how teams overcomes their biggest challenges.