Scrum

Unlike Modified Waterfall, Spiral, and "Iterative" methods whose basic blocks are the same, well-defined, blocks used in Classical Waterfall, the SCRUM approach incorporates a phase (called the Sprint phase) where the analysis, design, and development processes are not well defined, or unpredictable. A control mechanism is used to manage the unpredictability and control the risk. This results in flexibility, responsiveness, and reliability. This model is appropriate to projects with uncertain requirement and environment.

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