What is Spiral model - peak concepts

This model is organized like a spiral that has many cycles. Each cycle in the spiral begins with the identification of objectives for that cycle the different alternatives that are possible for achieving the objectives, and the constraints that exist. 

The spiral model is a risk-driven approach to software development that encompasses the best features of both classic life cycle and prototyping. In A quadrant different levels of planning are performed.

In B quadrant a thorough risk analysis is done and an appropriate prototype is initiated. In the C quadrant various software development products are sequentially completed. In the D quadrant client and management evaluate these products and provide permission to   continue to the next level of the spiral. Spiral goes from A to B, from B to C, from C to D and from D back to A until the complete system is developed and accepted.

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