Waterfall model is usually for large complex software project. It is a linear and sequential approach, the phases of waterfall model are Requirement collection and documentation, Project analysis, System design, implementation, testing, deployment, and maintenance. Water management is used to achieve the needs of the project, like concrete timelines, and well$-$defined deliverables. The water fall model is only useful for project under certain conditions. The requirements and timeline should be well known, sufficient resources, using understandable technologies and doesn$$t require any change to the requirements.

The waterfall model benefits vary and to develop a complete large complex project smoothly, it should have a clear, detail, and well understood requirements. Also, in water fall model, the phases increment where you can$$t go to the next phase without going to the other, this helps in having a efficient high quality project that meets all standards. Tasks in the project are also distributed and organized accordingly. Also, the cost and time are highly predictable, where the project can do the studies and allocate resources due to the requirements.