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Spiral Model and it's Advantages and Disadvantages

Spiral Model:
The spiral model is a realistic approach to the development of large-scale software products because the software evolves as the process progresses. In addition, the developer and the client better understand and react to risks at each evolutionary level.
It maintains a systematic stepwise approach, as classic Life Cycle model, but incorporates it into an iterative framework that more reflect the real world.

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