The V testing model is one of the most widely used and accepted testing model in the Industry. It is much preferred because this model emphasizes that both testing and development activities go on hand in hand simultaneously.
Each stage in waterfall development model coincides with corresponding stage in testing. While the waterfall development model works from top to bottom V model works the other way round. The coding is integrated with unit testing, the low level design coincides with the system testing. High level design with integration testing and the requirement gathering with acceptance testing.
The advantage of v model is the early detection of bugs in the product as testing commences hand in hand with development. Bugs discovered at the lowest level are easier to fix and do not iterate to be bigger issues in the end product
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