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Software Development Models - Waterfall-Model
Software Development Models
(Continued from previous question...)
Software Development Models - Waterfall-Model
One of the first models for software development is the so-called waterfall-model.
The individual phases i.e. activities, that were defined here are to be found in nearly all models
proposed since. In this it was set out that each of the activities in the software development must be
completed before the next can begin. A return in the development process was only possible to an
immediate previous phase.
In the waterfall-model, testing
directly follows the implementation.
By this model it was suggested that
activities for testing could first be
started after the implementation.
Preparatory tasks for the testing
were not clear. A further
disadvantage is that testing, as the
last activity before release, could be
relatively easily shortened or
omitted altogether. This, in practice,
is unfortunately all too common.
In this model, the expense of the
removal of faults and defects found
is only recognisable through a
return to the implementation phase.
(Continued on next question...)
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