Waterfall model - Wikipedia
https://en.wikipedia.org/wiki/Waterfall_model
OverviewHistoryModelSupporting argumentsCriticismModified waterfall modelsRoyce's final modelSee alsoThe waterfall model is a breakdown of development activities into linear sequential phases, meaning they are passed down onto each other, where each phase depends on the deliverables of the previous one and corresponds to a specialization of tasks. The approach is typical for certain areas of engineering design. In software development, it tends to be among the less iterative and flexible approaches, as progress flows in largely one direction ("downwards" like a
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