The spiral model is developed by: a Barry W. The key features of agile processes are shown in Figure 2. Software quality determines how good the software designed is quality of design , and how good the software conforms to that design quality of conformance. A working product is produced after each iteration, rather than producing a software product at the end of the life cycle as done in traditional approaches. Addition of new functionality at later stages always makes the life difficult for software developers.
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