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The '''waterfall model''' is a [[sequence|sequential]] [[design]] process, often used in [[software development process]]es, in which progress is seen as flowing steadily downwards (like a [[waterfall]]) through the phases of Conception, Initiation, [[Analysis]], [[Software design|Design]], Construction, [[Software testing|Testing]], [[Implementation|Production/Implementation]] and [[software maintenance|Maintenance]].
[[File:Waterfall model (1).svg|350px|thumb|right|The unmodified "waterfall model". Progress flows from the top to the bottom, like a waterfall.]]{{Software development process}}
The waterfall development model originates in the [[manufacturing]] and [[construction]] industries: highly structured physical environments in which after-the-fact changes are prohibitively costly, if not impossible. Since no formal software development methodologies existed at the time, this hardware-oriented model was simply adapted for software development.{{Citation needed|date=August 2011}}
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