A single source of truth is a data problem before it is a reporting problem

Every marketing team eventually hits the wall where ad platform numbers, CRM numbers, and finance's ledger all disagree. The fix is rarely a better dashboard. It is a warehouse layer that reconciles spend, leads, and revenue against one consistent definition.

Once that layer exists, every team downstream — growth, finance, leadership — starts arguing about strategy instead of arguing about whose number is correct.

Define your metrics once, in one place

A metric like "qualified lead" or "activated customer" needs exactly one definition, owned by one team, referenced everywhere else. The moment two dashboards compute the same-named metric differently, trust in both of them erodes.

Design for auditability from day one

Finance will eventually want to trace a revenue number all the way back to the raw platform data that produced it. Build the warehouse so every transformation step is logged and reversible, not just so the final dashboard looks clean.

Start with the three joins that matter most

Before building an elaborate schema, get spend-to-lead, lead-to-opportunity, and opportunity-to-revenue joining cleanly. Those three joins resolve the vast majority of the disputes marketing and finance actually have.