One version of the truth is a decision, not a tool

“One version of the truth” is one of the most-sold promises in the data industry. Buy the platform, consolidate the sources, and everyone will finally see the same numbers. Then the platform arrives, and finance still reports a different revenue figure from sales, because the two teams never agreed what revenue means.

The truth is not a technical artefact. It is an agreement. And agreements are made by people with the authority to settle them.

Why the numbers disagree

In most organisations, the same word carries several definitions. An “active customer” is anyone who logged in this month to one team, anyone with a paid contract to another. Neither is wrong. They are answering different questions. The disagreement only becomes a problem when both numbers appear in the same meeting and nobody can say which one to trust.

Ownership is the missing piece

A shared definition survives only when a specific person owns it. Not a committee, not “the data team” — a named owner who decides what the term means, documents it, and adjudicates when a new use case appears. This is unglamorous work, and it is the single highest-leverage thing most organisations can do for the trustworthiness of their data.

• Pick the twenty terms that appear in leadership decisions.
• Give each one an owner and a written definition.
• Make that definition the only one wired into reporting.
• Route every “but we calculate it differently” back to the owner, not into a new spreadsheet.

The tool comes after the decision

Once the definition is settled and owned, the technology becomes straightforward: encode it once, in the model, and serve it everywhere. The platform is genuinely useful here — but only because the human decision was made first. A tool can enforce a definition. It cannot invent the agreement.

So when someone promises you one version of the truth out of the box, read it as a question rather than a feature. Who, in your organisation, has the authority to decide what the numbers mean? Answer that, and the truth follows.