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Waterfall Model Is Based On Sequential Process

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Waterfall model is based on sequential process that is used in software development process. It takes place in steps. It is called as waterfall because it moves step by step in downward direction. As seen in manufacturing and construction site, each process is well structured and carried out step by step, in software development Waterfall model carries out all phases in sequential manner. All the phases like Conception, Initiation, Analysis, Design, Construction, Testing, Implementation and Maintenance are carried out in a sequential manner, step wise. It is stated that the first formal description of Waterfall model was made in 1970 in the article written by Winston W. Royce. Though the first use of waterfall model was made in 1976 in the article written by Bell and Thayer.

2.0 Spiral Model
2.1 Introduction & Overview [2]
Spiral model is another alternative process that is used in software development cycle. It is more focused on risk analysis. It is based on unique risk pattern that is adopted by the software. It can adopt any of the software development process such as incremental, evolutionary prototype and waterfall model. This method was introduced in 1986 in paper written by Barry Boehm. This model has four phases Planning, Risk Analysis, Engineering and Evolution. At each progress the software project has to be passed through all these four phases. The baseline spiral is reference for each other subsequent spirals. The baseline spiral starts with the planning

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