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When to use the waterfall model

publish date: 2026/05/28 22:08:32.137190 UTC

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The waterfall model is not suitable for all types of systems.

In which situation is the waterfall model most appropriate?

When the system must be delivered in many small increments with frequent changes.

When no documentation is required by stakeholders.

When requirements are highly volatile and poorly understood.

When requirements are well understood and unlikely to change significantly.

When requirements are well understood and unlikely to change significantly.

The waterfall model works best when requirements are stable and can be specified in detail early in the project.

Software Engineering, Ian Sommerville, 9th edition