The single metric a company designates as its measure of delivered customer value, used to align every team's work.
No verified coiner. Sean Ellis is closely associated with the idea; his verified coinage is 'growth hacking', 2010.
// Where it sits
Every North Star starts on the left and travels right at a speed proportional to how seriously it is taken.
What it really means
The name contains its own refutation, and almost nobody using it notices.
Polaris is chosen as a navigational reference because it is very nearly fixed — under a degree from the celestial pole. It does not respond to being looked at. Sailors have steered by it since the early medieval period — once precession brought it near enough to the pole — precisely because nothing a sailor does can move it.
A metric is the opposite kind of object. It is produced by human behaviour, and the behaviour changes when the metric becomes important. Which is Goodhart's Law, stated in 1975: any observed statistical regularity tends to collapse once pressure is placed on it for control purposes.
So the North Star Metric is, structurally, the practice Goodhart's Law warns about, and it is usually adopted by people who also quote Goodhart's Law approvingly.
Both can be right, briefly, and the sequence is predictable. A well-chosen metric genuinely aligns an organisation — it stops six teams optimising six things that quietly cancel out, and that alignment is worth a great deal. Then, over time, it becomes the thing performance is judged by, at which point people optimise the number rather than the thing the number was standing in for. The metric is now measuring compliance with the metric.
The standard guidance is better than its reputation, and worth stating. Do not use revenue. Pick a metric reflecting core value delivered to users; make it actionable; make it not a ratio — because ratios can be improved by shrinking the denominator, which is to say by losing customers; and make it capable of scaling over time.
One much-cited historical example: the number of users who added seven friends in their first ten days. Oddly specific, and that specificity is the point — it is a measurable proxy for the moment a product becomes hard to leave.
The honest practice is therefore to treat a North Star as a fixed point with an expiry date, and to change it before the gaming does it for you.
Where it comes from
The metaphor promises a FIXED POINT — which is precisely what Goodhart's Law says a target cannot remain. The name contains its own refutation.
Myths & misconceptions
Sean Ellis coined the North Star Metric.
His verified 2010 coinage is 'growth hacking'. Neither his biography nor the interviews in which he discusses choosing a North Star credit him with originating the phrase — he gives guidance on PICKING one, which is not the same as inventing the idea.
Revenue is the obvious North Star.
The standard guidance is the reverse: pick a metric reflecting core VALUE DELIVERED TO USERS. It should be actionable, not a ratio, and capable of scaling over time. One much-cited historical example was the number of users adding seven friends in their first ten days.
Compare & contrast
North Star Metric vs Goodhart's law
Goodhart's Law is the North Star Metric's built-in failure mode. The moment the star becomes the target, it stops measuring what it measured — the practice and the warning are the same sentence read in opposite directions.
| // | North Star Metric | Goodhart's law |
|---|---|---|
| Says | Pick one number | Targeting corrupts numbers |
| Timescale | Works at first | Bites later |
| Aware of the other | Rarely | n/a |
| Remedy | Change it periodically | Use several |
How it connects
- Goodharts Lawthe law this practice is a direct test of.
- Churnthe number that usually reveals when the North Star has been gamed.
Tell it apart
Questions people ask
- Who coined the North Star Metric?
- Not established. Sean Ellis is associated with it; his verified coinage is 'growth hacking' (2010). The phrase appears to have emerged in practice rather than from a single source.
- Should it be revenue?
- Standard guidance says no. It should reflect the core value delivered to users, be actionable, not be a ratio, and be capable of scaling over time. Revenue is a consequence, not a value.
- What's the Sean Ellis Test?
- Ask users how they would feel if they could no longer use the product; 40% or more answering 'very disappointed' is treated as a signal of product-market fit.