What are the three software development process models?
1) Waterfall: linear progression of project activities
2) Spiral: bends planning, requirements and design of waterfall back around
three times to allow these activities to be injected with activities of evolution,
risk, verification, and planning based on results of previous spiral. When
reach implementation level, activities follow waterfall model.
Evolutionary: output from each development activity is fed both backwards and forwards.
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