Many of the process models currently used can be more generally connected by the 'V' model where the 'V' describes the graphical arrangement of the individual phases. The 'V' is also a synonym for Verification and Validation.
By the ordering of activities in time sequence and with abstraction levels the connection between development and test activities becomes clear. Oppositely laying activities complement one another (i.e.) server as a base for test activities. For example, the system test is carried out on the basis of the results specification phase.

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