Spiral Model

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• Most generic of the models. Most life cycle models can be derived as special cases of the spiral model
• Set of important requirements are selected for each prototype. Thus, developers can split the requirements and work first on those with high priority
• Employs a risk management approach to software development especially in the stages of Specification, Design, Implementation and Integration
• Emphasizes the need to reiterate earlier stages a number of time as the project progresses
• Actually a series of short waterfall cycles, each producing an early prototype, representing a part of the entire project. It’s like using the waterfall model as guide in doing one prototype only.
• If one prototype is finished (except perhaps the polishing of graphics), a developer can proceed to the next prototype. Build, test and integrate to the first prototype
• Helps demonstrate a proof of concept early in the cycle
• Incorporates prototyping and software quality objectives
• Gives early focus to reusable software
• Accommodates life cycle evolution, growth and requirement changes
• Focus on early detection and design (architecture) flaws
• Useful in hardware-software projects

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