Every club has a dashboard and almost nobody has a decision

Performance departments now measure everything and change almost nothing, because no metric was ever tied to an action before it was built.

The screen on the wall of a modern performance office is genuinely impressive. Twenty tiles, colour coded, updating live. Sprint distance, high-speed running, sleep, wellness scores, a readiness index built from four of the others. Somebody spent a year building it.

Ask the obvious question and the room goes quiet. Which tile, going red, causes a named person to do a named thing today?

Usually none of them. The dashboard describes the squad; it does not instruct anybody. And a measurement that cannot change a decision is not information, it is decoration, however accurate it is and however much the software cost.

The failure happens at the design stage and it is nearly always the same. Somebody asks what can we measure rather than what will we do differently. Those produce completely different systems. Start from the action and you end up with three or four numbers, each with a threshold and an owner, and a written rule for what happens when the threshold is crossed. Start from the sensor catalogue and you end up with twenty tiles and a weekly meeting where everybody agrees the data looks interesting.

There is a second failure underneath. Most of these indicators are composites, built by combining things that move in different directions, and a composite conceals exactly the detail you need. A readiness score of sixty-two can come from poor sleep or from heavy load or from a player who dislikes filling in forms. Those demand different responses. The score gives you one output for three problems, and by the time you have opened it up to find out which, you have lost the advantage the summary was supposed to buy.

My rule would be blunt and unpopular. Any metric that has not changed a training session in six months gets deleted from the display. Not archived, deleted, so the screen holds only things with consequences attached. A performance department that survives that cull with five tiles is in far better shape than one that keeps twenty.

Coaches are not resisting data. They are resisting being handed a wall of numbers with no verb in it, and they are right to.

The purpose of measuring anything is to be wrong less often on Tuesday. If Tuesday looks the same either way, stop measuring it.