Waterfall Methodology

Waterfall model is a sequential model for software development in which each phase is followed by the next phase.

follows development process sequentially
must finish each step before moving on
phases do not overlap
mostly replaced by more flexible models
- but still in use for complex systems
used for development efforts that
- involve a fixed scope
- have known time frame for delivery
- are using a stable, well-understood technology platform
examples that use it
- software for space craft
- utility plants

Phases