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The Waterfall software development model has been in use for a number of decades and it is still commonly used in software development projects today. It is a sequential model where the development process goes through a number of phases in a certain order.
While it has been replaced to a large degree by the iterative models of software development, Waterfall still has its place in today's IT world. Basically, it requires that any project goes through the stages of requirements analysis, design, implementation (coding), verification, and maintenance.
In comparison to iterative models, the Waterfall model is seen as inflexible and linear—though it's preferred by many who feel iterative software development methodologies lack discipline. Although there are variations, in the true Waterfall model, the project only moves from one phase to the next when a phase is completed in its entirety. Therefore, no work will begin on the design phase until requirements analysis is complete. Also, there is no room for backtracking, so when a phase is complete it has to be right.
Read the article here: The Waterfall Model of Software Development
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