Review the finished prototype without editing its source first. Use a fresh or reset sample state and record the starting state.

1. Change a meaningful input or select a different option.
2. Predict which total, record or downstream summary should change.
3. Complete the main workflow.
4. Compare the final output with the choice actually made.
5. Refresh and verify persistence.
6. Check one invalid input and one unrelated record.

Capture receipts for each result. Separate tested behavior, source-code inspection and unverified behavior. Preserve the first-attempt artifact before proposing fixes. A working button or attractive screenshot is not sufficient evidence that the decision flows through.
