What does blind re-testing involve in QA practices?

What does blind re-testing involve in QA practices?

• A. Re-testing by independent analysts without knowledge of initial results
• B. Re-testing by the same analyst with disclosure
• C. Re-testing is optional and rarely done
• D. Re-testing only for obvious samples

Answer: (A)

Blind re-testing in QA practices is about having an independent analyst repeat the test without seeing the initial results. This separation prevents the second tester from being influenced by what the first tester found, reducing bias and increasing the likelihood that any mistakes are caught. The goal is to verify findings with objectivity, improving confidence in the results and ensuring they’re reproducible by someone else working independently.

Why this approach fits best: independent verification without access to the original conclusions provides a rigorous check against errors that might slip through on the first pass. Re-testing by the same analyst with disclosure can still be biased because prior results can color interpretation. Treating re-testing as optional or rare undermines verification, and re-testing only for obvious samples misses potential issues hidden in the rest of the data.