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Diagram: basic waterfall flow

publish date: 2026/05/28 22:08:31.281193 UTC

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The following diagram illustrates the classic waterfall flow of phases.

What does this diagram emphasize about the waterfall model?

Phases are arranged in a largely sequential, stepwise fashion.

All phases are repeated continuously in a tight loop.

Phases are executed randomly with no order.

Only testing and maintenance are important in the process.

Phases are arranged in a largely sequential, stepwise fashion.

The diagram shows a cascading sequence of phases, highlighting the stepwise nature of the waterfall model.

Software Engineering, Ian Sommerville, 9th edition