In this stage, the functional necessities of every model are analyzed; the models are tested and sent to the customer for input. After receiving feedback from the customer, the required changes are executed through Proceedings of the development stage. At the point when the second model is prepared, it is integrated with the first model, tested and then sent to the customer. The development, prototyping and testing stages are repeated until the last model is prepared. The final model is sent to the customer for a last feedback. The work done in this prototyping stage is reported and forwarded sent to the testing stage.