Spiral model can be viewed as a combination of the model and the waterfall model and also added an analysis of new risk.
In a spiral pattern, a software development process is possible as a spiral. The challenge in the spiral development process include:
setting goals: determine a goal for each phase of the project.
Evaluation and minimize risks: risks are assessed and action to minimize risk actually out.
Development and evaluation: after the risk assessment, a modeling system will be selected from the general model.
the plan: evaluation of the project and the next phase of the spiral model will be planned.
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