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Spiral Model

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Notes

Waterfall is a linear approach to the software development process that emphasizes a linear progression from beginning to end of a project. This methodology, often used by engineers, is front-loaded to rely on careful planning, detailed documentation, and consecutive execution.

Note: There is also typically a milestone between each development phase.

The Waterfall Method

You should move to a phase only when its preceding phase is reviewed and verified.

Various modified waterfall models (including Royce's final model), however, can include slight or major variations on this process.

Good for

• Simple systems
• enhancements in ongoing maintenance
• Mission critical systems (gated phases required)

Impacts

• Project failures
• Compressive documentation
• Detailed checklists