what is a good reference for this paragraph The Waterfall method is a traditional project management methodology that takes a well-defined project idea to completion through a sequential series of linear steps, tasks, and hand-offs. This straightforward and somewhat rigid method uses early planning and estimation to define and document project requirements prior to executing on the work. The Waterfall methodology centers around a visual timeline of the project. This makes it easy to see how long every task should take, who should be working on it, and what order work should be done in