Why we write down every scope decision

The decisions that sink a timeline are rarely the big, obvious ones — "should we use Postgres or Mongo" gets debated properly because everyone knows it matters. The ones that sink a timeline are the small calls made offhand on a call, agreed to by everyone in the room, and then never written down.

Three weeks later, someone asks "wait, did we actually decide that?" and the answer depends on who you ask. Re-litigating a decision that was already made costs more than making it did in the first place — and it costs trust, because it looks like nobody was listening the first time.

The fix is mechanical, not cultural: every scope decision gets written down the same day, in a place everyone can see, in one or two sentences — what was decided and why, not a transcript of the discussion. It takes minutes and it removes the ambiguity that re-litigation feeds on.

It also does something less obvious: it makes the cost of scope creep visible. When every addition to a defined build is a written line item, 'just one more small thing' stops being invisible, and the conversation about trade-offs happens honestly instead of by accretion.