Since these words are used so frequently without definition, let’s define them. An iterative process is one that makes progress through successive refinement. According to the iterative Waterfall model in software engineering, all the project phases are completed at a time. For such cases, the Agile Iterative Approach helps to minimize the cost and resources needed each time an unforeseen change occurs. Agile methodology, follow an iterative development approach because of this planning, development, prototyping and other software development phases may appear more than once. In Agile they follow an iterative development approach. All the project development phases like designing, development, testing, etc.

are completed once in the Waterfall model. Scrum, like all of the agile processes, is both iterative and incremental. The outcome of the subsequent iteration is an enhanced working increment of the product. This is to say that each iteration cycle incorporates the Analysis of the plan, the Design, its Code and simultaneously the Test. Agile model Incremental development model; Agile model is an incremental delivery process where each incremental delivered part is developed through an iteration after each time box. In agile, there is an incremental and iterative development approach. Agile approach incorporates the philosophy of iterative and incremental software development that is modeled around a gradual increase in feature additions and a cyclical release and upgrade pattern. This is repeated until the product accomplishes the required functionalities. The work is prioritized on the basis of business or customer value. Often project managers prefer Agile as a more flexible model. [2] Larman explains that the model functions on an ADTC Wheel (Analysis, Design, Code, Test). Each iteration is focused on producing a working product. A development team takes a first cut at a system, knowing it is incomplete or weak in some (perhaps many) areas. Waterfall software development model is structured and often rigid. There are cross-functional teams that work on the iterations of the product over a period of time. The Agile Iterative Model is perhaps best explained by Craig Larman in his book Agile and Iterative Development - A Manager's Guide. So some of the phases can appear more than once. The Agile Iterative Approach is best suited for projects or businesses that are part of an ever-evolving scope.

The main principle of the Agile model is to achieve agility by removing unnecessary activities that waste time and effort. Projects that do not have a defined set of requirements intended for a defined set of time.

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