Waterfall

The waterfall model is a sequential design process, used in software and project development processes, in which progress is seen as flowing steadily downwards (like a waterfall) through the phases of Conception, Initiation, Analysis, Design, Construction, Testing, Production/Implementation and Maintenance.

Conception
    Initiation
        Analysis
            Construction
                Testing

                Requirements
                    Design
                        Implementation
                            Verification
                                    Maintenance

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