01Start with the decision the data supports
Identify the user, the question and the action the answer should inform. Agree the reporting period, relevant population and exclusions. A metric definition should make it possible for two reviewers to reach the same interpretation.
02Reconcile identity across the sources
Map customer, product, location or transaction identifiers and record where matches are uncertain. Review missing values and differing levels of detail. Do not hide a many-to-many relationship behind a join that changes the apparent total. Working example: A client hierarchy and service metric dictionary.
03Make transformation and timing visible
Document source ownership, cleaning rules, accepted late records and refresh cadence. Distinguish event dates from the time a source was updated. Users should know when a report is complete enough for the decision they want to make. For business-service account and document handoffs, agree how branch staff, account operations and specialist reviewers contribute where those functions are involved.
04Give quality issues an owner
Set checks for required fields, duplicate keys and meaningful reconciliation totals. Show which inputs failed and who can correct them. Dashboards should expose material limitations instead of presenting uncertain records as equally reliable. Review check: Users can explain which accounts a reported total includes.