The advantages of waterfall development are that it allows for departmentalization and control. Technology is understood and is not dynamic.Īmple resources with required expertise are available to support the product. Requirements are very well documented, clear and fixed. Some situations where the use of Waterfall model is most appropriate are −
Sequential sdlc model software#
Waterfall Model - ApplicationĮvery software developed is different and requires a suitable SDLC approach to be followed based on the internal and external factors. The next phase is started only after the defined set of goals are achieved for previous phase and it is signed off, so the name "Waterfall Model". Maintenance is done to deliver these changes in the customer environment.Īll these phases are cascaded to each other in which progress is seen as flowing steadily downwards (like a waterfall) through the phases. Also to enhance the product some better versions are released. To fix those issues, patches are released. Maintenance − There are some issues which come up in the client environment. Post integration the entire system is tested for any faults and failures.ĭeployment of system − Once the functional and non-functional testing is done the product is deployed in the customer environment or released into the market. Integration and Testing − All the units developed in the implementation phase are integrated into a system after testing of each unit. 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. 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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