What project management approach requires each phase to be completed before starting the next one?

The Waterfall approach to project management is characterized by its linear and sequential process, where each phase must be fully completed before the next phase begins. This model is particularly beneficial for projects with clearly defined requirements and scope, as it allows for meticulous planning and documentation at each stage.

In the Waterfall model, the project progresses through distinct phases: requirement analysis, system design, implementation, testing, deployment, and maintenance. Since each phase relies on the deliverables of the previous one, it offers a structured environment that ensures stability and oversight throughout the project lifecycle.

This contrasts with methodologies like Agile and Scrum, which prioritize flexibility and are designed for environments where requirements may evolve over time. The Iterative approach, on the other hand, allows for phases to be revisited as needed, which differs from the strict sequential nature of Waterfall.