In software development, this approach is often known as the waterfall model, i. e., one series of tasks after another in linear sequence.

Progress flows from the top to the bottom, like a cascading waterfall. The waterfall model is a sequential design process, often used in software development processes, in which progress is seen as flowing steadily downwards ( like a waterfall ) through the phases of Conception, Initiation, Analysis, Design, Construction, Testing, Production / Implementation, and Maintenance.

The waterfall model provides a structured approach ; the model itself progresses linearly through discrete, easily understandable and explainable phases and thus is easy to understand ; it also provides easily identifiable milestones in the development process.

It is perhaps for this reason that the waterfall model is used as a beginning example of a development model in many software engineering texts and courses.

Advocates of Agile software development argue the waterfall model is a bad idea in practice — believing it impossible for any non-trivial project to finish a phase of a software product's lifecycle perfectly before moving to the next phases and learning from them.

The implication of this is that it is impossible to perfect one phase of software development, thus it is impossible if using the waterfall model to move on to the next phase.

While all software development models bear some similarity to the waterfall model, as all software development models incorporate at least some phases similar to those used in the waterfall model, this section deals with those closest to the waterfall model.

For models that apply further differences to the waterfall model, or for radically different models seek general information on the software development process.

* The standard waterfall model for systems development NASA webpage, archived on Internet Archive March 10, 2005.

Common Criteria assurance requirements tend to be inspired by the traditional waterfall software development methodology.

The main entrance to the original development is marked by the Spring Hill waterfall on Spring Hill Drive and US Route 19 ( Commercial Way ).

The local waterfall was important for early industrial development and included 13 factories in the early 1800s.

This model of development combines the features of the prototyping and the waterfall model.

The spiral model combines the idea of iterative development ( prototyping ) with the systematic, controlled aspects of the waterfall model.

Iterative and incremental development are essential parts of the Modified waterfall models, Rational Unified Process, Extreme Programming and generally the various agile software development frameworks.

Their motivation for avoiding the waterfall life cycle was that the shuttle program ’ s requirements changed during the software development process ".

The waterfall in the pilot episode was produced by making a model version of a library film of a waterfall available to Anderson and fading from the model to the film of a waterfall running, so the water seemed to appear by magic.

The unmodified " waterfall model ".

The first formal description of the waterfall model is often cited as a 1970 article by Winston W. Royce,

In Royce's original waterfall model, the following phases are followed in order:

Thus the waterfall model maintains that one should move to a phase only when its preceding phase is completed and perfected.

Various modified waterfall models ( including Royce's final model ), however, can include slight or major variations on this process.

This is the central idea behind Big Design Up Front and the waterfall model: time spent early on making sure requirements and design are correct saves much time and effort later.

A further argument for the waterfall model is that it places emphasis on documentation ( such as requirements documents and design documents ) as well as source code.

If a fully working design document is present ( as is the intent of Big Design Up Front and the waterfall model ), new team members or even entirely new teams should be able to familiarize themselves by reading the documents.

Some waterfall proponents prefer the waterfall model for its simple approach and argue that it is more disciplined.

" The name Takinoue, which literally means " Above the Waterfall ," originates from the first Japanese settlers who founded the city upstream from a waterfall.

In 1798, four years after Eli Whitney began manufacturing the cotton gin in New Haven, he made arms for the U. S. government at a mill site in Hamden, where a waterfall provided a good source of power.

The Wellington Rock, a construction of several rocks piled on top of each other, is 45 feet ( 14 m ) high and a small waterfall drips over it into a pond.

The waterfall Rjukanfossen on the Måna river allowed construction of Vemork, the largest power station in the world in 1911.

Locating the abandoned waterfall has been made difficult in recent years since the Deer Pen was partially filled with tons of fill dirt from nearby construction projects.

The waterfall utilizes water from a natural spring found underneath the building during construction.

The 60-MW Vemork power station at the Rjukan waterfall was the world ’ s largest power plant when it opened in 1911, after six years of construction.

In 1780, Paul and Thomas Sandby began construction of a much larger lake at the site, and went on to add an artificial waterfall, Meadow Pond and Obelisk Pond.

A $ 6. 9 million addition to the Middleton Hall of Science is just one in a long string of major construction and landscaping projects since the early 1990s, including Founders Village Apartments, the Middleton wing for Nursing, an enlarged Dining Commons, the Everest-Rohrer Chapel / Fine Arts Center, Wiekamp Athletic Center, Shiloh Prayer Chapel, the campus ponds and waterfall, Morey Soccer Field, Taylor Memorial Chapel, Jenkins Stadium, Sailor Residential Center, Miller / Moore Academic Center, Bethel College Bookstore, and Sufficient Grounds Coffee House.

Either way, rejuvenation results in a " knickpoint ", as it appears on a river's long profile, which often turns out to be rapids or a waterfall, such as Seljalandsfoss in Southern Iceland, where isostatic ( dynamic ) uplift has occurred as a result of both construction and deglaciation.

Since construction of Googong Dam in 1979, the endangered Macquarie perch has been very occasionally reported in the reservoir, and rarely beyond the first waterfall upstream of Googong Dam, despite the introduction of 57 Macquarie perch in the 1980s.

Well known for its natural beauty and grandeur, the 320-feet ( 98 meters ) high waterfall is also the primary source of electric power for the city's industries, being harnessed by the Agus VI Hydroelectric Plant.

It is neither hindered by highly random motion ( such as the surface-water turbulence in a large waterfall ), nor helped by the absence of motion ( such as static landscape shot by tripod ), which are two opposite extremes commonly used to test interframe video-formats.

The latter plunges into Bear Creek which leads to the canyon, is highly seasonal, and is Alabama's highest waterfall at.

The cascades demo showcases D3D 10 features by rendering a dynamically generated highly detailed floating 3D rock on the GPU and running a particle physics based simulation of a waterfall on the GPU which interracts with this 3D rock.

The nearby waterfall is about 10 meters in height, built of rough-hewn stones, and set within a highly picturesque surrounding.