W Model
From the testing point of view all of the models are deficient in various ways. The test activities first start after the implementation. The connection between the various test stages and the basis for the test is not clear. The tight link between test, debug and change tasks during the test phase is not clear.
Need of W Model
In the models presented above, there usually appears an unattractive task to be carried out after coding. In order to place testing on an equal footing, a second 'V' dedicated to testing is integrated into the model. Both 'V's put together give the 'W' of the 'W-Model'.
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