4.2 Traditional Process Models
In this section, several of the earlier software development models will be presented. Each of these models has also been adapted and modified to fit different situations. We will present the models only in their generic form.
4.2.1 Waterfall Model
The waterfall software development process model is probably the oldest publicized model. It is sometimes referred to as the classic software life cycle model. Although many organizations used this model, Royce (1970) is one of the earliest people to write about this model. The name of the waterfall model is derived from the process it represents: tasks occur sequentially one after another, with the output from one task dropping into the next task, as shown in FIGURE ...
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