Why I keep a single source of truth

Across every program I have run, one habit has paid off more reliably than any clever strategy: insisting on a single source of truth. One place where the real status lives, defended against the natural tendency of information to scatter.

The failure it prevents is subtle and corrosive. When status lives in five places, it effectively lives in none, because no one can trust any single one of them. People stop acting on information and start litigating it. Meetings get consumed by arguing about whose number is right instead of deciding what to do about the number.

I watched a fifty-project portfolio nearly come apart for exactly this reason, status drifting across spreadsheets and inboxes until leadership could not get a straight answer. The fix was not more sophisticated tooling. It was the discipline of declaring one place to be the truth and relentlessly pulling everything back to it.

The hard part is not technical. It is social. A single source of truth only works if people actually use it, which means resisting the constant temptation to track ‘just this one thing’ in a side spreadsheet, and gently dragging every stray update back into the canonical place. Entropy is always pulling the other way.

It sounds almost too simple to bother saying. But I have come to think most coordination failures are really information failures wearing a costume, two people acting on two different versions of reality and calling it a disagreement. One trusted source of truth quietly dissolves an astonishing number of those before they start.