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What is the Waterfall model?

A waterfall model is what most people think of when they think about project management.

The classic waterfall model is derived from the project management used in the construction industry, where each step needs absolute agreement so that the proper materials and services can be ordered. Many software consultants over the years have clung to the waterfall model as a way of shoring up management support.

The theory is that you can pin down the business stakeholders by making them commit in writing to a description of exactly how the system will work, thus making it impossible to change minds later on.

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