What is the diff. Between Waterfall and Spiral model?

Answer Posted / surendra

water fall model is a sequential model where each phase is done with the completion of the previous stage and the customer feed back or the end user feed back is taken after the implementation phase.
spiral model is an iterative and incremental model using the
prototyping technique.In this model customer involvement is done in each and every phase changes can be implemented in any stage of the process. And also time is not much wasted in the spiral model when compared to the water fall model.Testing and risk analysis is also easily handled in the spiral model this is somewhat difficult when compared with the earlier model.
The most advantage of the spiral model is TESTING is easily
implemented.

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