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The Waterfall model is originally invented by Winston W. Royce in 1970. He wrote a scientific article that contained his personal views on software development. In the first half of the article, he discusses a process that he calls “grandiose”. He even drew a figure of the model, and another showing why it doesn’t work (because the requirements always change). This model is the waterfall. He used it as an example of a process that simply does not work. In the latter half of the article he describes an iterative process that he deems much better.
