The Spiral Model of Software Development
In response to what was is often seen as the restrictiveness of the Waterfall model of software development, many developers began to look for a new set of methodologies that would help overcome many of the Waterfall development constraints.
One of these new models was the Spiral model of software development, also known as Boehm's model. Basically, the Spiral model is a cross between the Waterfall and Prototype models, and generally involves four stages in each of the following iterations:
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