The definition of V & V is Verification & Validation. Some people think that validation is done before verification and other think that verification is done before validation but in fact the second thought is correct, verification is done before verification, the reason for is as discussed further in the article.
The V & V Model means Validation & Verification Model in Software Testing, in which we work on development and testing simultaneously. Validation is done following Software Testing Life Cycle (STLC) and Verification is done Software Development Life Cycle (SDLC).
According to the basic definitional understanding
Verification asks: Are we building the right software?
While Validation asks: Are we building the software right?
The purpose of Verification is to ensure that selected work products meet their specified requirements and the purpose of Validation is to test that a product fulfills its intended use when it is it's placed in the intended environment. The V & V Model explains the activities that are carried out during verification and validation process during software testing.
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