The Waterfall Model

The waterfall model approach in project management has gotten its name due to the cascading effect of its stages; there is a progress from a certain stage to another like in the waterfall flow. The function and management undergo different stages and step-by-step procedure wherein in a certain stage you cannot jump to the next step without completing and perfecting the previous one, the initial stage serves a prerequisite to the next stage and so on.
Also in this approach, once you completed a certain level or stage you can not go back to the prior stage. There is no leaping back and overlapping allowed between different phases. The waterfall model is also referred as the linear sequential model or the software life cycle. This model has eight distinct, sequential phases which are the system viability, system plan, outline design, detail design, coding, execution, and operation and maintenance(in sequential order). Each phase also has a justification or confirmation segments.
In justification, the result is being tested whether it fits the operation used, meaning the result is being validated. In confirmation, the system structure is being verified to know if correct operations are applied. The model enforces disciplines as it requires the prior stage be completed first before you may proceed with the next phase, as each stage has its starting and ending point and progress can be categorically recognized. This approach is valuable in information technology for the better understanding of the whole system.

The operations in information technology are sequential; you cannot understand the higher phase of the system without fully understanding the basics. The output of the previous stage will be the input for the next stage. Furthermore, the model has a sequence of activities that is clear, understandable and easy to follow which makes it easy for everyone to use. In addition, it will present a more accurate project management and control because the system requires completion and perfection of a certain stage before moving on to the next.