Spiral pattern can be seen as a combination of the waterfall model and models and also added a new component - a risk analysis.
In the spiral model, software development process is performed like 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 implemented actions to reduce risks.
Development and evaluation: after a risk assessment, a model construction system will be selected from the general pattern.
Scheduling: project assessment and the next phase of the spiral model will be planned.
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