It is basically, performed with the intent to check that whether the developed software is built as per pre-decided software requirement specifications (SRS) and if it caters to fulfil the customers' actual needs in the real environment. Both, the verification and validation is a software testing activity, and verification is followed by the validation. Validation is usually carried out at the end of the software development.
Validation is an actual testing performed on the software product. It gives answer to our query of "Are we developing the right software product?" Further, it also ensures the identification of defects that were got missed during the verification process.
As told earlier, validation is the actual testing performed on the software product. Thus, it requires proper testing strategy to follow. According to ISO / IEC 12207:2008, validation process includes:
Some of features of Software Validation are:
It is a technique of assessing the software's working, on the basis of available specifications only, and being unaware of knowledge and understanding of the internal features and structure of the software.
It involves testing of software's functionality, with the knowledge of internal working and structure of the software, by the testers.
Gray-Box Testing is a combination of black-box testing and white-box testing approach, that enables to evaluate the functionality of the software, externally, from users-perspective, by executing test plans and cases, prepared from limited knowledge of the internal features, functionality or details of software.
Keeping in account, benefits linked with validation, it becomes essential to make software product, go through validation process which is nothing but, an actual testing on actual software, so that the software product is readily acceptable by the end users to satisfy their end requirements, in real environment.