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With suitable illustration explain SPIRAL model evolutionary software development.

Understanding the Spiral Model in Evolutionary Software Development

What is the Spiral Model?

  • Iterative software development model.
  • Risk-driven approach.
  • Combines elements of waterfall and prototyping.
  • Suitable for large, complex projects.

Key Stages of the Spiral

  • **Planning:** Define objectives, alternatives, constraints.
  • **Risk Analysis:** Identify and analyze potential risks.
  • **Engineering:** Develop, test, and validate a portion of the system.
  • **Evaluation:** Review progress, assess risks, plan next iteration.

Spiral Model Illustration

  • Imagine a spiral with multiple loops.
  • Each loop represents an iteration (a cycle).
  • Each loop builds upon the previous one.
  • The radius of the spiral increases with each iteration, representing increasing complexity and functionality.
  • The loops are divided into the four stages mentioned above.

Advantages of the Spiral Model

  • Early risk identification and mitigation.
  • Accommodates changing requirements.
  • Continuous improvement and evolution.
  • User involvement throughout the process.

Disadvantages of the Spiral Model

  • Requires significant expertise in risk management.
  • Can be costly and time-consuming if not managed properly.
  • Difficult to estimate the total cost and time.
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