This model is useful where developers themselves provide the specification.In other words, requirement is not provided by the user ,but developer make list of the possible requirements and then they make the software and launch it in market.After the feedback from the users are totally.Such changed software is launched in marcket with a different example,Word 95 was released at first,after some time,Word 97 was released with some modification,likewise Word 2000 and Word Xp etc.So,in short what we can say is that this model combines both the models 'Waterfall' and 'Prototype'.
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