It is rare for the waterfall style of model to show the various activities that occur across all life-cycle phases. For example, the diagram omits important activities such as project management, quality management, and configuration control. A further weakness of many waterfall models is the treatment of maintenance. Maintenance in this example is shown as a single box: this is the view of a system as perceived by the supplier, and particularly a supplier who has no responsibility for software maintenance. In reality each maintenance action will follow the full life cycle from feasibility through to implementation.
See also spiral model, V-model.
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