the development process proceeds down the left-hand slope of the V defining requirements and designing system
components. At
the base of the V,
the code is written. On the upward-sloping right
side of the model, testing of components, integration
testing, and, finally, acceptance
testing are performed.
A key concept of this model is that as requirements
are specified and components designed, testing for those elements is also
defined. In this manner,
each level of testing is clearly
linked to a part of the analysis
or design phase, helping to ensure high quality and relevant
testing and maximize test effectiveness.