NPS is the bedtime story you tell the board.

We all know the scene. The quarterly business review. Slide fourteen. A single large number sits in the middle of the screen, colour-coded green because it went up two points since last quarter. The CEO nods. Someone from finance writes it down.

The number is your Net Promoter Score. It tells you almost nothing useful. But it does, reliably, get everyone in the room to feel like things are under control.

That is what a bedtime story does. It is not designed to inform you. It is designed to calm you down.

A good idea, poorly handled

Fred Reichheld introduced NPS in a 2003 Harvard Business Review article called "The One Number You Need to Grow." The pitch was elegant. Ask customers one question: how likely are you to recommend us on a scale of zero to ten? Subtract the detractors from the promoters. That number is your NPS.

On paper, it was useful. A single signal, consistently collected, that pointed toward whether customers were likely to grow your business or undermine it. Simple enough to report. Simple enough to act on.

Then someone put it on a performance review.

This is Goodhart's Law in action. The economist Charles Goodhart observed that when a measure becomes a target, it ceases to be a good measure. The moment NPS was tied to bonuses, quarterly targets, and board slides, the organisation stopped using it to understand customers and started using it to produce a number. Those are different activities. They produce different results.

The part nobody says in the meeting

NPS scores are highly sensitive to when you ask the question. Ask immediately after something goes well and you get high scores. Ask after a customer has waited forty minutes on hold, discovered an unexpected charge, or tried to cancel something and found the button mysteriously difficult to locate, and you get low scores.

CX teams figured this out quickly. They do not say it out loud.

Retail staff hand over iPads immediately after a positive exchange, timing the ask for peak goodwill. Call centre scripts remind callers that anything below a nine is considered a fail, which has nothing to do with the caller's experience and everything to do with someone's target. Survey pop-ups appear before the page has loaded, asking customers to rate an experience they have not yet had.

The number goes up. The CX stays the same.

And here is where it gets genuinely comic. The NPS went up two points this quarter. The head of CX attributes it to the new onboarding flow launched in March. Nobody mentions that the All Blacks won the Rugby World Cup final the weekend before the survey went out and the entire country was, statistically, in an unusually good mood. Correlation is not causation. NPS is not a controlled experiment. You are surveying real people in the chaos of real life and recording whatever they happen to feel when the email arrives.

The customers who never show up

Here is the structural problem nobody talks about in the quarterly review.

The very happy and the very angry complete surveys. Everyone else deletes the email. The mildly frustrated, the quietly resigned, the customers already considering a switch but not motivated enough to explain why: they never appear in the data.

They appear later, in the churn numbers.

By then, the NPS had been green for months and the explanation would need to be inventive. The score was not lying. It was just describing the minority of customers who felt strongly enough to fill in a form most people treat as noise. It said nothing about everyone else.

That silence is the most expensive signal in CX. It never makes slide fourteen.

What you are left with

A number between minus one hundred and one hundred. A quarterly ritual. A green slide.

The number goes up, someone gets credit. The number goes down, someone gets a difficult conversation. The CX that produced either result remains, largely, a mystery.

The score became the target. The target replaced the customer. That is not measurement. That is theatre with better graphics.

The organisations that genuinely understand their customers are mildly embarrassed by NPS. They treat it as a rough signal at best, and spend most of their energy looking at what customers actually did rather than what they said they might do when a survey caught them right after a rugby result.

There is nothing wrong with telling the board a bedtime story. Sometimes people need to sleep.

Just do not confuse it for the morning news.