This is one of the most important parts of product design. The following are the factors important regarding the validation.

•  Validation should be done at the right time.
•  It should be derived from the documents such as DFMEA, DRBFM (Design review based in failure modes) and robustness matrix
  
•  Should have a set of test plans for each validation.
•  The records pertaining to Validation should be continuously updated and the team should be aware of the results.
•  Reliability monitoring should be done while validation to ensure achieving targeted reliability.