Tooltips on every single number.
“Because users had been burned by bad data in the past, trust was low. We added a tooltip to every metric showing its exact definition, calculation logic, and last-validation date. In week one, users hovered over them 4,000 times. Once they verified the system wasn't lying, they trusted it implicitly.”
NLQ shows its math.
“When you ask a plain English question, the UI returns the chart—but also features an expandable tab showing the exact SQL it generated. Non-technical users ignore it; technical users inspect it to verify accuracy. Transparency builds confidence.”