Each unit is developed and tested for its functionality, which is referred to as Unit Testing. Implementation − With inputs from the system design, the system is first developed in small programs called units, which are integrated in the next phase. This system design helps in specifying hardware and system requirements and helps in defining the overall system architecture. System Design − The requirement specifications from first phase are studied in this phase and the system design is prepared. Requirement Gathering and analysis − All possible requirements of the system to be developed are captured in this phase and documented in a requirement specification document. The sequential phases in Waterfall model are − The following illustration is a representation of the different phases of the Waterfall Model.
In this Waterfall model, typically, the outcome of one phase acts as the input for the next phase sequentially.
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In "The Waterfall" approach, the whole process of software development is divided into separate phases. Waterfall approach was first SDLC Model to be used widely in Software Engineering to ensure success of the project. In this waterfall model, the phases do not overlap. This means that any phase in the development process begins only if the previous phase is complete. The waterfall Model illustrates the software development process in a linear sequential flow. The Waterfall model is the earliest SDLC approach that was used for software development. In a waterfall model, each phase must be completed before the next phase can begin and there is no overlapping in the phases. It is also referred to as a linear-sequential life cycle model. The Waterfall Model was the first Process Model to be introduced.
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