From spreadsheets to a single source of truth, without the big-bang rewrite

Every growing business hits the same wall eventually. The spreadsheets that got you this far can’t carry you any further, and there are now five versions of the same numbers floating around with no agreement on which one is right. The instinct at that point is to rip it all out and replace everything in one go. That instinct usually ends in tears.

Why big-bang rewrites stall

A full replacement asks you to specify the whole thing up front, freeze the business while it gets built, and trust that the new system will be better before a single person has touched it. It’s slow, it’s expensive, and the risk all lands at the end. Worst of all you see no value until the day it ships, which is precisely the wrong way round.

Consolidate one decision at a time

Pick one question your leaders actually ask. “How are we tracking this month?” will do. Then build the smallest slice of data plumbing that answers that one question reliably, wiring in only the sources it genuinely needs and ignoring the rest. Once people trust the number, you move on to the next question.

Each pass quietly retires a spreadsheet, hands you something usable straight away, and tells you what the next step should be. After a few months you’ve got a single source of truth. Not because you bet the business on one giant rewrite, but because you replaced the spreadsheets one trusted answer at a time.