SYSE.31:4.6 - Verify that the arrangement improves useful feedback

Exercise a known passing case, a meaningful failing change and a failure of the feedback mechanism. Check that the responsible person can distinguish them and recover the tested subject. Inspect late-discovered defects: did the arrangement omit a needed question, use the wrong conditions, or fail to deliver its result in time?

Return the checks, their supported questions and conditions, remaining evidence gaps, and the actual failure-response arrangement. Improve from useful detection and repair, not from test count or green percentage alone.