Goodhart’s Law, named after British economist Charles Goodhart, captures a simple but powerful idea: when a measure becomes the target, it stops being a good measure. The moment we shift our attention from the goal itself to the metric meant to track it, the metric starts to distort the very thing it was supposed to reflect.
This shows up clearly in behaviour change. A common piece of advice is to track how often you practice a new habit, the logic being that measurement keeps the brain engaged, makes the behaviour feel achievable, and builds momentum through visible progress. On the surface, this is sound advice.
But there’s a quiet danger here. Once tracking becomes the focus, people can slowly lose sight of why they started tracking in the first place. The goal was never the streak, the checkmark, or the number, it was the actual change in behaviour. Yet it’s easy to slip into a mindset where maintaining the record becomes the achievement itself, even if the underlying behaviour has become hollow or mechanical.
For example, someone trying to build a reading habit might start tracking minutes read each day. Over time, they may find themselves “reading” just to hit the number, skimming pages without absorbing anything, because the goal has quietly shifted from understanding to logging.
This doesn’t mean tracking is bad. Measurement can be a useful scaffold, especially early on. But it works best when treated as a support system, not the destination. The questions worth returning to often are: Is this measurement still serving the original goal? Or has the goal quietly reshaped itself around the measurement?
Goodhart’s Law is a reminder to stay anchored to purpose. Tools, metrics, and tracking systems are meant to serve transformation, not replace it. The real win isn’t a perfect log, it’s becoming the kind of person who no longer needs one.
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