Use pass/fail tests for product verification (reliability tests, development or confirmation tests) and freeze the design in advance. (Such as: acceptance criteria for performance and function inspections, etc.)
Use pass/fail tests for product validation (reliability tests, development or validation tests) and pre-freeze designs. (e.g. performance, functional inspection acceptance guidelines, etc.)
Product verification (reliability test, development or validation test) using pass / fail test, and pre freeze design. (e.g. performance, functional inspection acceptance criteria, etc.)