The whole sign-off, judged print by print.
When Vivo's B2B billing changes, someone has to prove the change worked: today that gets checked by hand, line by line, across three documents. This POC reads the entire sign-off package and judges every step in the test script, with the print as proof.
The test script is the ruler. Every change generates a package: the Story (the request and its acceptance criteria), the CDT (the test script, the ruler) and the ECT (the evidence: the prints of what QA ran). Signing off means proving the evidence meets the script.
Why it hurts. Manual, line-by-line comparison across documents, step by step, print by print; rework every round; slow feedback back to QA.

Nothing is approved in bulk. Every step in the script gets its own status, and a failure becomes a named callout back to QA:
Step-by-step judgment, with one hard rule: a field without proof does not count as conforming.

Trust here is not an adjective, it is a measurement: three independent checks audit the pipeline every round.
And one rule that runs through the whole project: agreement never becomes accuracy. Two evaluators can be wrong together, so the number published is always the most conservative one.