North star metric

What it is#

A north star metric is the one number an agency and client elevate above all others as the best single summary of whether the engagement is working. Where a client typically has three to five KPIs, it has at most one north star — the metric you would keep if you could keep only one.

The term comes from product companies, where the north star metric captures delivered customer value (nights booked, weekly active teams, songs played). For an agency engagement it plays the same role: it should track the client's actual business outcome, not the agency's activity.

Why it matters for agencies#

A north star metric disciplines the relationship. It gives the agency a clear answer to "is this working?" that doesn't shift month to month, and it gives the client a stable thing to renew against. It also protects the agency: when the north star is healthy, a soft month on a secondary metric is context, not crisis.

The risk to avoid is choosing a north star the agency can influence but the client doesn't care about — impressions, rankings, follower count. A good north star is uncomfortable, because it ties the agency's reported success to the client's real result.

In SendBriefs specifically#

A brief leads with the north star metric and frames the narrative around it, with KPIs and channel detail as supporting context below. The structure of the template mirrors the hierarchy: one headline number, then the explanation, then the evidence.