Prototype Model : This model is used when the customer don't know the exact project requirements. In this model a prototype of end project is developed, Tested and refined as per the customer feedback repeatedly till a final acceptable prototype is achieved. Which forms the basis for developing the final product.
Advantages :
1. Software rejection chances is low.
2. Highly stable product.
3. Flexible in design.
Disadvantages :
1. Too much of paper work.
2. Time consuming.
3. Costly with respect to time and money.
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