An output contract says which fields a receiving person or process can expect. Agree on names, order, types and the meaning of a blank before writing the result. Select makes that structure explicit. Keep identifiers as text when leading zeros matter and give numeric measures a numeric type so the next report doesn't have to guess.
Output Data receives the upstream stream; it cannot repair a misplaced join field or an ambiguous amount. Review the final Metadata and Data, then inspect the configured output filename and format. The local simulator records and downloads a training output rather than writing to a workplace location. A good handoff also explains exceptional records and the reporting period. Avoid adding an invented price, total or performance claim to make a file look complete.