I merged four sales channels into one number. Then I proved it was right. Building a unified multi-channel revenue dashboard took an afternoon. Reconciling it against the source of truth took the rest of the day — and that's the part that matters.
Your analytics dashboard is lying to you by leaving things out A brand I work with was sure it mostly sold bundles. The dashboard couldn't prove it either way — so I went and got the data it was quietly leaving out. The number ended the debate.