This is from software development communities that do not develop the early deliverables called for in the waterfall model (for example, a system design document). One source of problems in the waterfall approach is that there is little or no functionality that works, and then, at some point well into the project, a system appears.Some experts imply that this lifecycle is not appropriate for software development or is in part responsible for problems in software projects.The format of this model makes it easy to document, update, and refine using software such as Office Project and other Gantt chart–based project management systems.
I and others have used it successfully in its standard and modified forms. The waterfall model is simple, easy to learn, and easy to use. An alternative name for this model is the “Big Bang” lifecycle because working results first appear near the end of the process, something like how scientists describe the Big Bang theory of how the universe was created.
The name of the waterfall lifecycle model comes from its physical appearance, shown in Figure, and the process by which the results from one phase flow into the next.
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