Acceptance is the moment work stops being a deliverable and starts being an asset. Objective criteria say what "done" means in testable terms: the report contains these sections, the system passes these checks, the migration moves these records.
The alternative is acceptance "to the satisfaction of" the customer, which is not a standard at all — it is an open gate. A provider under that language can be asked to revise indefinitely, and if payment is tied to acceptance, the invoice stays open as long as the revisions do. A buyer, on the other hand, has no leverage at all if there are no criteria: you cannot reject work for failing a bar that was never set.
The fix both sides can live with is a stated test plus a deemed-acceptance window: the customer has a defined number of days to object with specifics, and after that the work is accepted. It gives the buyer a real look and the provider a definite end.
"Client shall notify Provider of any failure to meet the acceptance criteria within ten (10) business days of delivery, specifying the criterion not met. Absent such notice, the deliverable is deemed accepted."
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Definitions and negotiation guidance here are educational business decision support, not legal advice. Consult an attorney about how any clause applies to your own agreement.